1、break through

冲破；突破

Protesters tried to break through a police cordon.

抗议者们试图冲破警察的封锁线。

About fifteen inmates broke through onto the roof.

大约15名犯人闯到了屋顶上。

（克服困难或障碍）取得突破

There is still scope for new writers to break through.

仍有一些领域需要新作家们去开拓。

I broke through the poverty barrier and it was education that did it.

我摆脱了贫困，这要归功于教育。

显现；显露

Despite everything, Elizabeth's human side keeps breaking through.

不管怎样，伊丽莎白还是不断显露出其作为普通人的一面。

Sunlight had broken through the clouds.

阳光冲破了云层。

2、prevent

防止

These methods prevent pregnancy.

这些方法能防止怀孕。

Further treatment will prevent cancer from developing.

进一步的治疗将阻止癌症恶化。

阻止；制止；阻碍

He said this would prevent companies from creating new jobs.

他说这将使公司无法创造新的工作机会。

Its nationals may be prevented from leaving the country.

其国民可能会被禁止出境。