如果你不告诉他们，谁也不会察觉。

If you don't tell them, nobody will be any the wiser.

《牛津词典》

如果他们没有发现，我是不会告诉他们的。

I will not tell them until they find out.

youdao

他们的脸在说，如果想去他们会不会是傻瓜？

Their faces said, were they not noodles to want to go?

youdao

Until they stop, both of them stop doing that, there is not going to be any peace in Afghnastan.

如果他们两方不停止，阿富汗就不会有和平。

普林斯顿公开课 - 国际座谈会课程节选

But I certainly won't stop them from seeking plastic surgery if that makes them feel better about themselves.

但是如果整容可以让他们自我感觉更良好，我当然不会阻止他们接受整容手术。

整容是个人自由 - SpeakingMax英语口语达人

The person in the middle if they enter here loses, so they're not going to want to enter.

中间的那个人,如果他们参选将会失败,所以他们不会想去参选

耶鲁公开课 - 博弈论课程节选