这个数字反映原来人类的皮肤也像内脏一样五花八门，任何一处皮肤都住着500到1000个细菌种群。

The number suggests that our skin is as variegated as our guts, which house anywhere from 500 to 1000 bacterial species.

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在研究中，科学家们发现含有鲨烯的皮肤碎屑覆盖在室内各种物体的表面，使得窗户、门及沙发和皮肤一样，都能分解臭氧。

In this study, the researchers determined that skin flakes on surfaces were covering those surfaces with squalene, thus making those Windows, doors or couches break up ozone as well as skin does.

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实际上的意思是：最有可能被门夹到的皮肤层，而你做的美甲也会毁于一旦。

What it really means: The layer of dermis most likely to get exposed in a door slamming incident when your manicure is most thoroughly lit.

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