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Yawning is "contagious"
打哈欠会传染

　　Empirically, this is tough to deny; perhaps you'll yawn while reading this. The real question is whether there's actually something physiological at work here, and the answer is likely yes: even chimpanzees mimic each other's yawns.

　　几乎我们每个人都遇到过“打哈欠被传染”的情况，因此从经验上来讲，我们很难否认这种说法。真正的问题在于，这其中究竟有没有什么生理学上的依据在起作用，而答案很可能是肯定的。科学家发现，就连黑猩猩之间，打哈欠也是会相互传染的。