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He keeps at his studies, although he is ill. 他虽然生病仍坚持学习。

Keep away from that woman. 避开那个女人。

I'll keep nothing back from you. 我不会向你隐瞒任何事。

She couldn't keep back her tears. 她控制不住她的眼泪。

You have to be home by 11 o'clock. Keep that in mind. 你得在十一点前回家，记住这一点。

Keep off the grass. 勿踩草地。

He kept on till the work was finished. 他一直继续到把活干完。

Columbus kept on until he saw land. 哥伦布继续往前航行直到看见陆地。

Why do you keep on smiling? 为什么你老是笑？

The coat should keep out the cold. 这件大衣应能挡住寒气。

He always keeps to his promises. 他向来信守诺言。

She kept the news to herself. 她没把这消息告诉别人。

I hope the weather will keep up. 我希望这天气能继续下去。

We've kept up our friendship for over twenty years. 我们保持友谊已达二十多年。

Her spirits kept up in spite of all her trouble. 尽管出了许多烦心事她的情绪依然高涨。

She had to run to keep up with him. 她得跑着才能跟上他。

It's difficult to keep up with medical developments. 要跟上医学发展是困难的。

We're going to knock down those old buildings soon. 不久我们将把这些旧楼拆掉。

A bus knocked the child down. 一辆公共汽车把小孩撞倒了。

What time do you knock off? 你什么时候下班？

The boxer knocked out his opponent in the second round. 这位拳击手在第二回合就把对手击败了。

They knocked out a large number of enemy effectives. 他们歼灭了敌军大批有生力量。

Who knocked that bottle over? 谁把那瓶子打翻了？

I happened to know about him. 我碰巧了解他的情况。

I know of a hotel which might suit you. 我知道有一家旅馆可能适合你。