hard at it
adj. 勤劳地工作
例句与用法:
I've been hard at it all the morning.
我一上午都在卖力地干。
The policemen were already hard at it when we reached the scene of the accident.
当我们到达肇事地点时,警察们已经在哪里忙开了。
词形变化:
形容词比较级: harder | 形容词最高级: hardest |