at,in,on的用法和区别

例句：

Unemployment peaked at 17%.

失业率达到17%的最高点。

They returned at twilight.

他们在黄昏时返回。

She smiled sweetly at him.

她朝他嫣然一笑。

They lived in rooms in Kensington.

他们住在肯辛顿的出租房间。

We went skiing in France in March.

三月份我们去法国滑雪了。

He is now living in exile in Egypt.

他现在流亡在埃及。

The old men blather on and on.

这帮老头儿絮絮叨叨没完没了。

She went on and on about her trip.

她没完没了地谈她的旅行。

From now on you can work on your own.

从现在起你可以独自工作。