diligent in

• 勤勉于 ...

diligent in的用法和样例：

例句

1. He has been less than diligent in his form work and shows none of the promise of earlier years. He has of course always been old beyond his years and he has perhaps stayed on too long.
   他在提高竞技状态方面不够刻苦，再也不像早年那样显得有出息了。他当然总是不如同龄人那样对享乐或人生感兴趣，也许是他呆在原地不动的时间太长了。