And people in the 17th century, they didn't really understand the same way we do about you know, this stuff is a bunch of different kinds of molecules, and we breathe it in for a purpose and all that.
那时十七世纪的人， 他们不像我们， 知道空气是什么 空气不过是一堆不同的分子， 我们可以呼吸进去，在体内产生作用。