work hard at
解释
努力工作(或学习)
例句与用法
1. He worked hard at his biology.
他努力学习生物学。
2. If you work hard at other times, you won't have to sit up all night before the exam.
你平时如果努力学习，在考试前就不必这样整夜开夜车了。
努力工作(或学习)
1. He worked hard at his biology.
他努力学习生物学。
2. If you work hard at other times, you won't have to sit up all night before the exam.
你平时如果努力学习，在考试前就不必这样整夜开夜车了。