born in 後面一般是地名，或者是時間（某年或某月，但沒有精确到某天）
例如： My little daughter was born in December.
born on 後面一邊是跟某天 ，具體到天；
例如：My little daughter was born on a cold morning of December.
born in 後面一般是地名，或者是時間（某年或某月，但沒有精确到某天）
例如： My little daughter was born in December.
born on 後面一邊是跟某天 ，具體到天；
例如：My little daughter was born on a cold morning of December.
![高頻口語[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)