He died for a noble cause.

他为了高尚的事业而牺牲。

《牛津词典》

You've helped a noble cause.

你在从事一项高尚的事业。

youdao

I am not saying this is not a noble cause.

我不是说这种动机不高尚。

youdao

It is indeed a noble cause to seek a solution to long term unemployment.

FORBES: Labor Pains

In the process, its founders intend to fully underscore what they consider to be a noble cause.

CENTERFORSECURITYPOLICY: House 'Sovereignty Caucus' Aimed at Koh

The great teams we studied all had a noble cause, and, more than that, they had extreme clarity about that cause.

FORBES: Four Essential Qualities Of Great Teams