### 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 large, the hard ball can't stand it, and it is difficult for the masters to control it.
### 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 large". There is a major error of incorrect translation has stylistic problems at "the hard ball can't stand it". There is a major error of incorrect translation does not accurately represent the correct translation at "it is difficult for the masters to control it". There is a major error of wrong grammatical register (eg, inappropriately informal pronouns). internal inconsistency (not related to terminology) at "the masters".

### 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.