One pigeon was jumping up and down a lot, another one was bobbing its head, and another one was doing kind of a little dance.

它们有的上蹿下跳,有的摇头晃脑,还有的独鸽乱舞

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So there are more sophisticated approaches, some of them are mechanical.

那么这里还有更复杂的方法，有的人是无意识的。

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I mean, if the energy is lower to occupy a smaller volume, then if I have this room and a bunch of molecules of oxygen, and nitrogen and what have you in the air, and there are weak attractions between them, why don't they all just sort of glum together and find whatever volume they like.

我的意思是，如果占据小的体积会使能量降低，如果我有这样一个空间,和一些氧气，氮气和其他空气中有的气体，并且分子之间还有微弱的相互作用，为什么他们不黏在一起,然后占据他们所想要占据的体积。

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