So we can think of this term has to do with complementarity, or synergy, a very unpopular word these days but still: synergy.

因此我们可以把合作理解为互补或协同,虽然协同这个词现在不是很常用了

耶鲁公开课 - 博弈论课程节选

Very difficult problems, but in my judgement, all solvable if we generate the country in the kind of bipartizan political cooperation and political courage that will be necessary to fix them.

这些问题很不容易解决，但我认为,不是不能解决，只要我们,以这种两党制的合作形式治理国家,还要有治理它们的政治勇气。

普林斯顿公开课 - 国际座谈会课程节选

On the battlefield,even if Smith and Jones are both dying, it's not like this is some sort of cooperative, joint undertaking.

在战场上，Smith和Jones同时死亡，但是并不是在某种合作下，同时进行的。

耶鲁公开课 - 死亡课程节选