### 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 withstand, and the master is very difficult to control.
### Errors: There is a major error of incorrect translation is missing content from the correct translation at "the ball hits the racket". There is a major error of incorrect translation includes information not present in the correct translation at "the vibration is very high". There is a major error of incorrect translation has stylistic problems at "the hard ball cannot withstand". There is a major error of incorrect translation does not accurately represent the correct translation at "and the master is very difficult to control". There is a major error of wrong grammatical register (eg, inappropriately informal pronouns). internal inconsistency (not related to terminology) at "the master".

### 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.