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Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

author:When are the bean leaves yellow?

Preface

Television is indispensable in family life. Even if you say that the current TV boot rate is not high, it is always there, and it is necessary to exist - for example, to be a "mural" or atmosphere group in life, which is actually good. If... Friends who have elderly people and children at home need TV even more, and the same video content is always better for a family to watch on TV than on a mobile phone.

At the same time that we know that TV has its use,We should also know,Due to volume limitations,The sound performance of the TV's own speakers will be relatively average,If you want to make the TV have better acoustic performance in family life,It is still necessary to use it with external TV stereos,That is, to form a home theater system。

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

Of course,Because the TV boot rate is not high,I personally think that whether it is TV or TV audio,There is no need to spend too high a budget,Just use it,Money is more fragrant on the blade, right? TV stereo I also played some,My opinion is1000About TV audio,It is already very good to make up for the lack of TV with its own audio。

Therefore, when you buy TV audio, you can also refer to my price range. As for which brand and which product to choose, it is a matter of "opinion", and there is no standard answer. This article brings you a multi-dimensional horizontal evaluation of thousand-yuan TV audio under the four brands of Edifier、Xiaomi、Sony and JBL,I hope to provide some useful references for you to buy similar products。 Without further ado, let's get to the main text.

1. Price (25%)

We often say that choosing a product needs to be considered in combination with personal budget and usage needs, and even make trade-offs. It's the same when it comes to TV audio,Let's take a look at the price of these 4 TV audio:

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲Edifier B2SW is in the preferential period recently, from 20 o'clock on April 16 to 24 o'clock on April 19, the discount is 130 yuan on the basis of the original price, and the arrival price is 869 yuan, and you can enjoy 12 interest-free periods and 5000 Beijing beans for posting.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲The price of Xiaomi TV audio is only499element,The price has been strong recently。

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲Sony HT-S400 on April 15 20:00 open the discount, the price is not higher than 1090 yuan, the benefits are mainly the host registration free QQ green diamond.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲JBL CINEMA STVJ200 recent price is 999 yuan, supporting 30-day price protection.

Summary:If you don't consider the price of configuration alone,Xiaomi TV audio compared with several others,The price is indeed lower;EdifierB2SW、JBL CINEMA STVJ200 AND SONYHT-S400There is a price gradient of about 100 yuan,To some extent,It will also affect consumption decisions。

Score

漫步者B2SW: ★★★★

Mi TV Stereo: ★★★★★

索尼HT-S400:★★★

JBL CINEMA STVJ200:★★★☆

2. Appearance and design (10%)

Edifier B2SW, Xiaomi TV Audio, Sony HT-S400 and JBL CINEMA STVJ200 all use a combination of soundbar + subwoofer, so when comparing the appearance and design, we will also discuss it separately from its split structure and overall matching effect.

2.1 Soundbar

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews
Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲The size of the soundbar of the Edifier B2SW is 792.5mm×93.5mm×70mm, and it is equipped with 2 1-inch silk seride dome tweeters and 2 53mm×93mm runway midrange units. The button is located in the middle of the front,The speaker outlet adopts a metal mesh cover,There is a product name logo on the top,There is a wall-mounted screw slot on the back,The plug-in hole is located at the back of the speaker。 The speaker is designed to be rounded throughout, and the opposite side adopts a pointed foot line, which will be more hardcore.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews
Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲The size of the soundbar of Xiaomi TV audio is900mm×102mm×63mm,Cubic structure,Carry2Full-range speakers and2Tweeter。 The middle of the front is Xiaomi's logo,The sound hole is designed with a cloth surface,The key area is located at the top,The plug-in hole is located in the middle of the rear。

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews
Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲Sony HT-S400's soundbar size is 900mm×88mm×64mm, and it is equipped with 2 sets of spatially balanced speakers. The sound outlet hole is metal mesh, the key area is located in the middle of the top, the back is the upper wall groove and the manhole, and the inner side of the back oblique is the power cable port and the signal cable port. The corners of the front end are rounded.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews
Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲The JBL CINEMA STVJ200 has a soundbar size of 1015mm×62mm×60mm and has 2 full-range speakers. The sound holes are made of metal mesh, while the rest of the vents are in obsidian black, with the buttons on the side and the cable socket on the back.

2.2 Subwoofer

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews
Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews
Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲The size of the subwoofer of the Edifier B2SW is 200mm×313mm×377.2mm, and the 6.5-inch sunken large dynamic woofer is located at the bottom of the subwoofer. On the side of the subwoofer, there are inverted holes, power switches, volume knobs and pairing buttons.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews
Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews
Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲The appearance of the Xiaomi TV audio subwoofer is shorter than that of the EdifierB2SWThe subwoofer is more sturdy,But there are similarities in design,For example, the inverted hole on the side、Volume knob and power switch,And the bottom6.5Inch woofer。 However, the volume knob of Xiaomi TV stereo is more rounded and beautiful in design,But it does not support Bluetooth connection to the main speaker,So there is a plug-in hole。

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews
Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲Sony HT-S400The subwoofer size is 192mm×400mm×387mm,Slim and long,160mm (about 6.3 inches)80W power woofer and inverted hole are located on the front side of the subwoofer,The back is the power button and power cord socket。

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews
Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲The subwoofer size of the JBL CINEMA STVJ200 is 150mm×320mm×220mm, which is also slender and compact. The inverted hole is located in front of the subwoofer,The size of the woofer is relatively small,The power is only30W,Connected to the main speaker through the wire,The wire is a pure copper wire used,Full of sincerity。

2.3 Combined Effects

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews
Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews
Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews
Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲As far as my use case is concerned, JBL CINEMA STVJ200 the advantage of the small size of the subwoofer, which can be placed directly under the TV wall without affecting the cleaning of the floor because it is placed on the ground.

Summary: In terms of exterior design, I think the Edifier B2SW and JBL CINEMA STVJ200 stand out the most, because their shapes are more rounded, which can be softer and can blend into the home environment more softly without being obtrusive. JBL CINEMA STVJ200, the soundbar has a good texture, and the subwoofer is small enough, so it is not easy to disobey when matching scenes. However, in terms of performance configuration, the number of soundbar speaker units in the JBL CINEMA STVJ200 is relatively small, and the power of the subwoofer is also small, so if you want to combine performance, appearance, and design to consider comprehensively, the Edifier B2SW will be the best choice among the 4 speakers.

Score

漫步者B2SW:★★★★★

Mi TV Stereo: ★★★★

索尼HT-S400:★★★★

JBL CINEMA STVJ200:★★★★☆

3. Connectivity and ease of use (15%)

3.1 Connections

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲Edifier B2SW supports OPT (optical), COAX (coaxial), LINE IN (line input) and AUX (audio input) and other wired input methods, and also supports Bluetooth 5.3 connection. The connection between the soundbar and the subwoofer relies on Bluetooth pairing, and because it is not connected by wire, it will be more refreshing in the use of the scene.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲Xiaomi TV audio supportOPT、COAX andAUX3 wired input methods,It also supports Bluetooth5.0Connecting the sound source,SW OUT is used to connect the subwoofer using cable。

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲Sony HT-S400 supports OPT wired input and HDMI output (audio return channel), and also supports Bluetooth 5.0 connection to audio sources. It is worth mentioning that,If the user is using Sony TV,Then SonyHT-S400The connection ecology between TV and TV will be more perfect,The sound quality and operation convenience that can be achieved will also be higher。

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲JBL CINEMA STVJ200支持OPT、COAX有线输入和HDMI ARC输出,支持蓝牙5.1连接。

3.2 Ease of Use

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲The remote control equipped with the Edifier B2SW can switch between the sound connection mode and the sound effect mode, and can be paired, volume adjustment and program switching and other functions.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲In addition, you can also adjust the volume and other simple operations on the body of the Edifier B2SW. However, since it is equipped with a remote control, it is generally more convenient to use the remote control to control the speaker.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲Edifier B2SW also has a better configuration is the heterochromatic light display under different connection methods, which allows users to intuitively understand the current connection mode when using the speaker, so as to call relevant functions and eliminate problems faster.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲The subwoofer and the main speaker are paired through Bluetooth is also a practical function, saying goodbye to the wire connection is more refreshing, with the status indicator light, the connection status is also clear at a glance; support individual bass adjustment, you can also achieve a richer combination of sound effects.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲Xiaomi TV stereo is not equipped with a remote control,But directly through the buttons on the top of the soundbar to achieve the connection mode and sound mode switching,And call volume adjustment。

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲Although there is nothing wrong with pressing the touch button of Xiaomi TV audio,It's also sensitive to excitation,But just imagine,If you're watching TV,If you need to call the corresponding use function,You have to leave the sofa to come to the TV next to the button,Then go back to the sofa,Then remember what new function to call,You have to leave the sofa... Isn't it inconvenient?

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲The connection between the main speaker of Xiaomi TV audio and the subwoofer is connected by wire,Compared with Bluetooth pairing, the scene matching will not be so refreshing。 However, I have to say,Xiaomi TV stereo continues the high-value attributes that are customary to rice household appliances in design,It is also to adjust the volume of the subwoofer,Its knob feels very good,Strong sense of science and technology。

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲SonyHT-S400The remote control function does not pay attention to mode switching, but in the sound quality and sound technology that it is good at, such as Sound Field and BASS (low frequency) adjustment, which is very operable.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲The button function on the soundbar is also easy to operate.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲SonyHT-S400The display interface is relatively strong,It is not a general indicator,It's an OLED display,Compared with a simple indicator display,It can more intuitively display the input sound source、Volume、Sound field、Voice mode and night mode and other remote control functions of the real-time status information。

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲The connection between its main speaker and subwoofer is also achieved through Bluetooth pairing, so it is the same as the Edifier B2SW, and there is no problem of dragging wires.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲The remote control of the JBL CINEMA STVJ200 uses logic more similar to that of the Edifier B2SW, which is mainly used to switch the sound connection method and program, pairing, adjusting the volume, etc.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲The operation logic of the physical buttons of the main speaker is also simple,Including connection mode switching、Volume adjustment and power switching。 The method of the side buttons,The method of the top button of the other three speakers is different,But when using,It does not cause any inconvenience to operate。

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲The different connection methods of the JBL CINEMA STVJ200 are also displayed through the different colors of the indicator light, but it is not as intuitive as the Edifier B2SW and Sony HT-S400.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲The connection between the main speaker and the subwoofer is even more crude,Because it is not only a wire,Or a fixed wire,Although there is no way to determine the durability of this wire,But if it breaks down one day,You have to send the subwoofer for repair together。

Summary:In terms of wired connection,EdifierB2SW's interface is the most abundant;And in Bluetooth connection,EdifierB2SW5.3Bluetooth connection protocol version supported,Followed by JBL CINEMA STVJ200 5.1,Finally, Xiaomi TV audio and Sony HT-S400Bluetooth5.0;

The connection between the main speaker and the subwoofer,EdifierB2SW and SonyHT-S400Both are Bluetooth pairing methods,The use scene is relatively refreshing;Xiaomi TV audio and JBL CINEMA STVJ200 are all wired,It's not so convenient,Especially JBL CINEMA STVJ200,The subwoofer can't even adjust the volume alone。

In terms of ease of use,EdifierB2SW、SonyHT-S400andJBL CINEMA STVJ200 are equipped with remote control,It will be relatively simple to control,Xiaomi TV audio needs to be controlled through the main speaker button,Relatively speaking, it is not so convenient。 In terms of status indication,SonyHT-S400With OLED display,The most advanced,EdifierB2SW's indicator light also looks intuitive,Xiaomi TV stereo and JBL CINEMA STVJ200 Although there are also status indicators,But relatively speaking, it is not so intuitive。

Score

漫步者B2SW:★★★★★

Mi TV Stereo: ★★ ☆

索尼HT-S400:★★★★★

JBL CINEMA STVJ200:★★★☆

4. Sound quality and sound effects (40%)

Sound quality and sound effects are the core issues that everyone will consider when buying TV audio,But it will also be more subjective in terms of experience,So here is a combination of some of my personal experiences to share with you,For reference。

4.1 Edifier B2SW

▼Edifier B2SW main speaker + subwoofer realized,It is a simple and practical 2.1 multi-channel system,Its main functional units include:

(1) 1-inch silk seride tweeter (2 units). The high-concentration 5000cc magnetic liquid is used to construct a high-performance NdFeB strong magnetic circuit, which has high resistance, low distortion and excellent treble performance;

(2) 53mm×93mm large diaphragm midrange unit (2). Driven by strong magnetic drive of double neodymium iron boron, the runway diaphragm increases the sound area without increasing the height, so it can provide full sound pressure, and the output sound syllables will appear full and powerful;

(3) 6.5-inch wireless subwoofer (1 pc). The MDF wooden cabinet reduces resonant coloration and has a high degree of sound reproduction, and the ground-mounted pressurization design of the sunken large dynamic woofer can improve the sense of low frequency volume and obtain deeper and more stable sound diving performance.

The Edifier B2SW can achieve a power of 90W and a peak of 180W, so it can create a good immersive experience.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲In the actual experience, I played a relatively rich variety of audio sources, as well as exciting and cool car chase action blockbusters, science fiction films, warm films, cartoons and other film and television resources. What impressed me was the detail of the sound quality presented by the Edifier B2SW, the extremely high degree of restoration and the abundant sense of volume.

The reason why I feel impressed is that this realistic and full sound experience makes it easy for me to immerse myself in it - lying on the sofa with my eyes closed and listening to the cold pipa and warm saxophone in "Pipa vs. Saxophone", lingering in my ears like a lover's duet, watching the exciting scene of "Transformers 5" when the mechanical dinosaurs appear seem to sweep me into the extraordinary ancient cold metal age, and then being swept into the extraordinary ancient cold metal age in "Avengers 4" When he fell into despair, when reinforcements arrived, when the dead battlefield turned to boiling blood, his own blood was also boiling... This is probably where sound comes in.

4.2 Mi TV Stereo

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲The physical configuration structure of Xiaomi TV audio is comparable to that of EdifierB2SW,It also includes2full-range speakers、2Tweeter and1x6.5Inch subwoofer,Up to 100W total power。 As far as the actual experience is concerned,The clarity of the sound quality of Xiaomi TV audio is still good,The degree of restoration is also okay,But the sense of low frequency volume is slightly insufficient,The peak amplitude modulation is not very high,There is a sense of unrealism that the sound is too far away from people。

4.3 索尼HT-S400

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲Sony's audio and video products have always had a good reputation,SonyHT-S400No exception,It usesS-Force ProFront virtual surround technology、Dolby sound and spatial balance speakers and other technologies and configurations,Achieve excellent surround sound effect,And then through160mm 80W large-caliber subwoofer(Slightly smaller than the size of EdifierB2SW and Xiaomi TV audio),Achieve a surging and shocking bass atmosphere experience。 In terms of actual experience,SonyHT-S400It does bring a good sense of presence,The low-frequency sound field is majestic,The sound quality details are also more delicate,In the emotional expression of some warm movies,It has a good appeal;In the sound effect expression of blockbusters,It also reflects its balanced characteristics,The sound field audio details give the senses of listeners in different directions in the room,The sameness is relatively high。

4.4 JBL CINEMA STVJ200

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲JBL CINEMA STVJ200's soundbar is relatively slim and long, with a good look and feel, and the subwoofer is also small in size and easy to place, which has been mentioned above. However, it is precisely because of its small size,The number of speakers and size configuration are inferior to the previous 3 speakers,The maximum total power is only80W,So it will be relatively weak in terms of sound field density,There may not be much difference when watching life films,But when watching visual effects blockbusters,The immersive experience will also be weaker,The sense of scene substitution will be lost。

Its intelligent DRC function experience is good,When switching between different sound sources,There will be no instantaneous increase in sound,So the transition when switching scenes will be relatively silky,This function is naturally good when the movie transitions。

Summary: As far as my personal listening experience is concerned, I think among the 4 products, the comprehensive strength of Edifier B2SW and Sony HT-S400 is the strongest, Edifier B2SW is strong in the degree of restoration and volume, and Sony HT-S400 is strong in the sense of volume, delicate sound quality details and good spatial balance. The actual experience of the low-frequency volume sense of Xiaomi TV audio will be relatively average and relatively rough;JBL CINEMA STVJ200 is also a feeling of insufficient sense of volume,But the experience of intelligent DRC is good。

Score

漫步者B2SW:★★★★★

Mi TV Stereo: ★★★

索尼HT-S400:★★★★★

JBL CINEMA STVJ200:★★★★

5.App placement (10%)

Traditional speakers generally do not come with an app, and in essence, they may not affect normal use. However, with the in-depth development of digitalization and informatization, I think it is still necessary to optimize software in addition to traditional physical configuration. EdifierB2SW、Xiaomi TV audio、Sony HT-S400 and JBL CINEMA STVJ200 these 4 speakers,Only EdifierB2SW is equipped with an App,Share it here,You can refer to whether its App function is practical。

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲Like input source settings, sound effect modes, and volume adjustments, we can also switch them by using the remote control or the body buttons (of course, it will be more convenient to call on the mobile phone). I think the most useful thing is the custom function of the sound mode, which allows users to call up their favorite sound effects according to their personal preferences.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲Then there is the intelligent control experience such as speaker shutdown, timed shutdown, disconnecting Bluetooth, restoring factory settings, etc., as well as the interface display that can be used in the drop-down box of the mobile phone for simple and fast sound switching.

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲Of course, Edifier Connect itself is an App platform with a high degree of integration of functions and products, you can communicate with Edifier users in the community, you can enter the Edifier Mall to see if there are any products you like, and you can also find some music you like in the music library to listen to.

Summary:I think the function of the App is very easy to use,But everyone's experience needs for the sound will be different,App is a useful but non-essential function,So in this link,I won't because the EdifierB2SW has an App,The other 3 speakers don't have an App on one side full score,0 points on the other。 I would consider the app as a nice addition to the icing on the cake, with the Edifier B2SW scoring a perfect score of 5, and the other 3 speakers giving them a base score of 4.5.

Score

漫步者B2SW:★★★★★

Mi TV Stereo: ★★★★

索尼HT-S400:★★★★

JBL CINEMA STVJ200:★★★★

summary

Combined with the individual scores of the above 4 TV audios,I calculated their weighted comprehensive scores,The results are as follows:

Which one is stronger in 1,000-yuan TV audio?4 mainstream brand home theater horizontal reviews

▲It can be seen from the results of the score sheet,EdifierB2SW can be said to be the most cost-effective one among the 4 TV audio,The price is right、The appearance design can be played、Various connection methods、Easy to use、Sound quality and sound effect performance are good,There is also a high degree of intelligenceAppFunction blessing,It is a TV audio model worth considering within 1,000 yuan。

In addition,SonyHT-S400The comprehensive score is also relatively high,In connection mode、Ease of use、Outstanding performance in sound quality and sound effect,Its main disadvantage is that it is the most expensive among the 4 TV stereos,The price has exceeded 1000element,So price-sensitive partners may put down this choice。 If there are no budget considerations, the Sony HT-S400 is naturally a model worth considering.

JBL CINEMA STVJ200 is not outstanding among the 4 products in terms of product performance alone, its advantage is mainly that it is small, if the home environment is more limited, you can consider this model with a mini temperament.

The biggest advantage of Xiaomi TV audio is that it is cheap,The price is almost half of the other 3 products,But let's say one,The product may not say that you get what you pay for,But it's definitely not realistic to pay a penny for a dollar,I think its overall sound quality and sound effect are still far behind the other 3,It depends on everyone's personal needs and trade-offs。

Okay,The above is all my comments on EdifierB2SW、Xiaomi TV audio、Sony HT-S400 and JBL CINEMA STVJ200 horizontal comments,I don't know if there is some reference value for everyone to buy a thousand-yuan TV audio?More questions,You are also welcome to leave me a message in the comment area,Or don't hesitate to point out my mistakes and omissions。

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