1、render

致使;造成

It contained so many errors as to render it worthless.

它错误太多,所以毫无用处。

barrel-makers whose trade was rendered obsolete by the introduction of stainless steel wine vats.

不锈钢葡萄酒桶的出现使木制酒桶制造者没了生意

给予(帮助);提供(服务)

He had a chance to render some service to his country.

他有了一个为国服务的机会。

Any assistance you can render him will be appreciated.

无论给予他何种帮助，他都会非常感激。

2、betray

失信于；辜负

When I tell someone I will not betray his confidence I keep my word.

如果我告诉某人我不会辜负他的信任，我就会恪守诺言。

The President betrayed them when he went back on his promise not to raise taxes.

总统背叛了他们，违背了不加税的诺言。

背叛；出卖

They offered me money if I would betray my associates.

他们提出来只要我供出同伙就给我钱。

The group were informers, and they betrayed the plan to the Germans.

这帮人是告密者，他们把计划泄露给了德国人。