At first, I'm not believed what she said, as I have made a lot of efforts on learning English, but it doesn't work.

一开始的时候我并不相信她所说的话，因为为了学好英语我已经做了很多的努力，但是都没有效果。

youdao

It's all very well for you to say it doesn't matter, but I've put a lot of work into this and I want it to be a success.

你说这无所谓当然容易，可是我却已经花费很大力气而且想要取得成功。

《牛津词典》

He doesn't particularly like the work but he sees it as a means to an end.

他不怎么喜欢这项工作，只是把它看作达到目的的手段而已。

《牛津词典》

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

But I think, as we think it all through we have to conclude it doesn't work. Okay.

但是我认为，我们考虑了一遍,给出的结论是它说不通，就到这里。

耶鲁公开课 - 死亡课程节选

But, it doesn't always work because you have to be damn sure you're right.

但此方法也不经常奏效因为你必须得,十分肯定你的做法是正确的。

耶鲁公开课 - 金融市场课程节选

Diversification is a powerful tool, but it doesn't work miracles.

FORBES: Magazine Article

But it doesn't always work.

ECONOMIST: Jeanne Calment

Or surely I'd about-face and on the double, But it just doesn't work anymore.

NPR: BPP Jukebox: Blues Traveler