From the word’s history
From Middle English skyn, from Old English scinn, from Old Norse skinn 'animal hide'; partly displaced Old English hȳd (hide).
源自古諾斯語 skinn「獸皮」，部分取代了古英文的 hȳd（hide）。
You can think of 'skin' as the thin outer layer wrapped around the outside of something — first the soft covering over a person's or animal's body. From that one picture everything else grows: the same kind of thin wrap on fruit, on a sausage, on cooling liquid, on a plane or even on a phone screen; that treat skin as the boundary between 'you' and the world (getting under it, no skin off your nose, only skin-deep); and the verb side — taking that outer layer off, or a bit of it away.
可以把 skin 想成包在某個東西最外面的那一層薄薄的覆蓋——最先是裹在人或動物身體外的那層軟皮。其餘用法都從這個畫面長出來：同樣那種薄薄一層，可以是水果的皮、香腸的腸衣、冷掉液體上的薄膜、飛機的外殼，甚至手機螢幕上的『外觀皮膚』；也有一串把皮膚當成『你』與外界那道界線的慣用語（鑽進皮膚底下惹你、與你無關、只是表面）；還有動詞那一面——把這層外皮剝掉，或擦掉一小片。
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