All his decisions have been entirely governed by self-interest.

他的所有决定都受利己之心的支配。

《牛津词典》

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》

To sum up: a system of conservation based solely on economic self-interest is hopelessly lopsided.

总而言之：一个完全基于经济利己主义的保护体系是不可救药的不平衡。

youdao

If not,the thinking goes, then self-interest will lead to overuse and destruction of shared resources.

VOA: special.2009.10.16

Why do people become firemen, policemen, soldiers, freedom fighters, all activities that cannot be explained in terms of self-interest alone?

不可能只用拿工资的理由，就能完全解释为什么总有人愿意做,消防员，警察，军人和争取自由的斗士？

耶鲁公开课 - 政治哲学导论课程节选

So very often, our self-interest will just stop our desire to do what's right.

所以我们的自身利益,会阻止我们去做正确的事。

普林斯顿公开课 - 人性课程节选

If this is his goal then acting in his self interest is completely possible.

FORBES: Self Interest: The Most Life Enhancing Driver of Them All

Or is it because the airlines have a self interest in not losing planes and passengers?

FORBES: Regulations Are Very Expensive, But Their Economic Value Is Negative

Self interest being a powerful motivator, employees are understandably focused on their own careers.

FORBES: Take Care Of Your People And They'll Take Care Of You