If it doesn't work, send it back to the maker.

如果不管用，就把它退还给制造厂家。

《牛津词典》

The clock is simply for ornament; it doesn't work any more.

这架时钟纯属摆设，它再也不走了。

《牛津词典》

If it doesn't work after you've tried everything, accept that there are always things you can't change.

如果在你尝试了所有的方法后仍然不起作用，接受这个事实：总有一些事情是你无法改变的。

youdao

"The way the system is now works for no one. It doesn't work for the immigrants themselves, it doesn't work for the government and it doesn't even work for some employers."

VOA: special.2010.07.03

Normally, we do these things to keep an equilibrium among the different systems of the unconscious, but sometimes it doesn't work.

一般来说，我们会运用这些机制,去维持无意识系统的平衡，但有时防御机制也会不起作用。

耶鲁公开课 - 心理学导论课程节选

If it doesn't work, change it and just keep revising it, eventually something good comes out of it.

如果行不通就换一个主题，一直修改下去，直到写出好的作品。

写作课程比较难 - SpeakingMax英语口语达人

If it doesn't work on Saturday, that's going to be just the way it is.

WSJ: Derby winner Orb arrives at Pimlico for Preakness

You fall in love, and it doesn't work our, and you talk about it.

NPR: Will 50 Cent Retire?

And then suddenly we tell people to do things differently, and it doesn't work.

CNN: Why the best thing you can do is fail