hard at it

1 Whatever you do, work hard at it and don't try to dodge the column.

无论做什么事, 都要努力去做,别偷懒.

2 You must have worked very hard at it.

你一定花了很大劲.

3 I studied art and worked hard at it.

我学的是艺术,也很努力.

4 I've been hard at it all the morning.

我一上午都在卖力地干。

5 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。

1 努力工作

hard-working graft put shoulder to the wheel

2 忙得不可开交

have hands full

3 拼命干

bullock do damnedest go it