diligent in的用法和樣例：
例句
- 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.
他在提高競技狀態(tài)方面不夠刻苦，再也不像早年那樣顯得有出息了。他當然總是不如同齡人那樣對享樂(lè )或人生感興趣，也許是他呆在原地不動(dòng)的時(shí)間太長(cháng)了。
