我寄宿家庭里的姐姐是一个非常用功的学生。

My host sister is a really hardworking student.

youdao

他年轻时不是一个很用功的学生。

He was not a very hard-working student when he was young.

youdao

一个用功的学生会取得很大的进步。

A student who studies hard will make great progress.

youdao

她证明了自己是一个努力用功的学生，她在小组合作中是愉快并且乐于助人的这意味着她喜欢团队合作。

She proved to be a most conscientious and hardworking student … She was pleasant, co-operative and helpful in group situations which meant she was well liked by others in the class.

youdao

她证明了自己是一个努力用功的学生，她在小组合作中是愉快并且乐于助人的这意味着她喜欢团队合作。

She proved to be a most conscientious and hardworking student … She was pleasant, co-operative and helpful in group situations which meant she was well liked by others in the class.

youdao