You say, anytime you have a vacuum state, you will discover that one wheel will not turn another one, if the only connection between them is whatever was there before the vacuum. That kind of thing.
你可以说，任何时候我们有真空， 一个风车都不能带动另一个转起来。 如果没有别的东西把它们连起来， 只是靠在抽真空之前的东西的话。这样的结论。