break down

break down      出故障，失败，垮掉，使分解，砸破

【例句】

◆ Plastic can't break down塑料不能分解。

◆ First, his two sledges breake down ,and then the horses began to have serious difficulties with the snow and the cold.先是他的两辆雪橇坏了，后来马匹开始应付不了积雪和严寒的天气。（北师大版，必修③，Unit 8）

◆ They didn't have grain for a month. But they didn't break down．他们断粮一个月了，但他们没有垮掉。

【微测】

I'm really lucky to have my bicycle, because my car is so unreliable. It____( break) down constantly, so I have to go back to the mechanic and, once again, deal with my issues.  

[breaks/is breaking]