英语语法分析

Fortunately, volunteers are not motivated by self-interest, but by altruism.

幸运的是，志愿者们不是被自身利益而是被利他主义推动。

《柯林斯英汉双解大词典》

Some even act out of sheer altruism.

有些行为甚至完全是利他的。

I don't think altruism is boring.

我不认为奉献是无聊的。