### Chinese: 它们强度很低，球打到拍子上面，振动非常大，硬球顶不住，高手都很难驾驭。
### English: Their strength is very low, the ball hits the racket, the vibration is very big, the hard ball <v>can't hold </v>it, and it is difficult for the master to control it.
### Errors: There is a minor accuracy/mistranslation error at "can't hold" within <v></v>.

### Improved English: They are low in strength, and there will be too much vibration when the ball hits on it; it cannot withstand hard balls, and even professional cannot handle it.
