It was unselfish of you to help us.

你无私地帮助了我们。

youdao

This way you offer help, you're very constructive and unselfish.

以这种方式助人，那你是有建设性的，是无私的。

youdao

But never for too long, because I had the help and support of an amazing, unselfish and fearless committee of fellow probation officers, who on top of their fulltime workloads, stood by me, reassured me, and above all inspired me, to keep going.

WHITEHOUSE: Saving Lives On and Off the Job

The unselfish reason: People are still in misery and my presence there, as an angler, would not help.

FORBES: Fishing In New York City After Hurricane Sandy