I beat my brains out to rescue him.

为了救他，我伤透了脑筋。

youdao

Why should I beat my brains out for the salary I'm getting?

我拿这么一点薪水，犯不着伤脑筋。

youdao

This VCR is too complicated for me! Okay, you've tried to teach me twice how to run it, but I beat my brains out again yesterday trying to tape a show and I still couldn't make it work.

这位太太说："这个录像机对我来说是太复杂了。是的，你已经教了我两次怎么操作这个录像机，可是，昨天我想把一个节目录下来，结果绞尽了脑汁到了还是没有弄清楚该怎么操作。"

youdao