Translation of "Vain" in Chinese

He didn't die in vain.

他没有白死。

All our efforts were in vain.

我们所有的努力都白费了。

All their efforts were in vain.

他們的努力都白費了。

Your death was not in vain.

你沒白死。

I tried in vain to deal with the problem.

我想解決這個問題，可是白費功夫。

I tried to talk him out of the project, but in vain.

我努力劝他远离那个计划，但是他不听。

All the doctor's efforts were in vain and the man soon died.

醫生雖然已經竭盡全力，但不久病人還是死了。