in order to help or bring advantage to someone

Please do it, for David's sake. 为了戴维，请做这件事。

Their parents only stayed together for the sake of the children. 他们的父母仅仅是为了孩子才没有分开。

I hope for both our sakes that you're right! 为你我着想，我希望你是对的！

because of, or for the purpose of something

Let's not disagree for the sake of (= because of) a few dollars. 咱们不要因为几块钱闹别扭。

Let's say, just for the sake of argument/for argument's sake (= for the purpose of this discussion), that prices rise by three percent this year. 为了便于讨论，我们假设今年的价格上涨3％。

You're only arguing for the sake of arguing (= because you like arguing). 你只是为争论而争论。

used to emphasize requests or orders when you are angry or have lost patience

For goodness' sake don't let her know I told you! 行行好，千万别让她知道是我告诉你的！

a Japanese alcoholic drink made from rice and usually drunk warm