I don't know if you know how a spark plug works, but for the electrical current to fly into operation in a spark plug, the two points of contact have to be gapped.

我不知道你们是否知道,火花塞是怎样工作的，在电流通入火花塞中使它运转之前，两个接触点之间需要有空隙。

耶鲁公开课 - 文学理论导论课程节选

In order for a design to work well we have to have every component there.

如果要使一种设计运转良好,这个设计的零部件就必须完整可靠

耶鲁公开课 - 金融市场课程节选