The old rules must be broken down. 这些陈旧的规章制度必须废除。

The police tried to break down the prisoners’ opposition.警方设法制服囚犯的反抗。

Because of explosion the bridge broke down last night. 由于爆炸， 昨夜这座桥倒塌了。

Your plan has broken down. What a pity! 你的计划失败了， 真遗憾！

After a long time of hard work， he almost broke down. 长时间艰苦劳动之后， 他的身体几乎垮了。

Why did the peace talks break down？为什么和谈失败了？

This matter will break down in water. 这种物质在水中会分解。

Last night a thief broke in and stole away his camera. 昨夜一个小偷闯了进来， 偷走了他的相机。

He broke in with some ideas of his own.

他插了话， 说了说自己的一些看法。

3. break into破门而入， 突然……起来

They broke into the prison and set free all the prisoners. 他们冲进监狱，释放了所有的囚犯。

Hearing the sad news， the old woman broke into tears. 听到这个悲哀的消息， 这位老年妇女突然哭了起来。

4. break out战争爆发， 争吵爆发， （火灾）发生

When did the war break out? 这场战争是什么时候爆发的？

I have heard that a quarrel broke out between them. 我听说他们之间爆发了争吵。

More than one hundred fires broke out in our city last year. 去年我市发生了一百多起火灾。

You must break away from these old customs. 你们必须破除这些旧风俗。

The dog broke away from its owner and ran away. 狗挣脱了主人， 跑了。