Not all of them were acting out of self-interest.

他们当中，并非所有人的行动都是出于利己的目的。

牛津词典

Their current protests are motivated purely by self-interest.

他们当前的抗议完全是受一己之利驱使的。

柯林斯高阶英语词典

Committing your life to creating value is in your own immediate and direct self – interest.

驱使你的生命去创造以你自己为中心的所想立即与直接获取的价值.

期刊摘选

Unlike the trust model, it channels both self interest and altruism to serve the public good.

和信任模式不同,这个模式引导了自己兴趣和利他主义去服务公共物品.

期刊摘选