Our clinical generally divides it into four levels.
The first level is like this soft tofu, so that you can't live an X life;
The second level is like this peeled banana, which is not useful in the middle, and he cannot hand over his homework;
The third level is like a banana with a skin, and generally can live an X life;
The fourth level is as hard as a cucumber, which is the best.
Clinically able to live X life, the hardness of this little brother is generally in the third to fourth level, this hardness is our nationally recognized measurement of tintin B hardness of a standard.