So if you wanna do something conditionally, you generally needs to ask the question, is the following true or false.

假如想在一定条件下做一件事情，你需要判断下这个条件，来看看条件是真还是假。

哈佛公开课 - 计算机科学课程节选

So if you would want to do this condition or this one, you don't want to break those conditions up because you want to let those people in or that family in either way if either of those conditions is true so you can or them together.

所以你想要处理这个条件或这一个，你不想打破这些条件因为你想,让这些人进来或者那个家庭进来,不过怎么样，如果其中任何一个,条件成立，你可以进来或跟他们一起进来。

哈佛公开课 - 计算机科学课程节选

This was a first order condition or a first order necessary condition.

这个只是一阶条件,是必要条件

耶鲁公开课 - 博弈论课程节选