Again, I don't have data to back this up, but just common sense suggests to me that the common case is if I'm on the subway platform I want to get on that train and maybe I want to get back and where are those two buttons, right?

此外，我没有数据来备份这个，但是常识告诉我，常见的情况是,如果我站在地铁站台上，我想乘上地铁,可能我还想回来,那么哪里能找到这两个按钮，对不？

哈佛公开课 - 计算机科学课程节选

Where is the button that just says click here to do the most common case?

哪里有一个按钮，当你点击它的时候,它可以处理最通常的情况？

哈佛公开课 - 计算机科学课程节选

This is optimized not for that common case but for all possible cases.

这不是通常情况的最佳化,而是各种可能的情况。

哈佛公开课 - 计算机科学课程节选