### 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: They are very low in intensity, the ball hits the racket, the vibration is very high, the hard ball cannot <v>withstand</v>, and the master is very difficult to control.
### Errors: There is a minor fluency/grammar error at "withstand" 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.
