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Most of us are familiar with calluses.
對(duì)于“老繭”，我們都很熟悉。
These extra-tough patches of skin are generally quite useful-we might even say handy-because they act likea kind of natural armor,
這些皮膚上突出的硬皮是很有用的，也可以說(shuō)是方便，
protecting areas of skin that get an unusual amount of wear and tear.
因?yàn)樗麄儼缪葜Ｗo(hù)常磨損皮膚的天然盔甲的角色。
Have you ever wondered exactly what a callus is, or how it forms on your skin?
你是否思考過什么是老繭?他又是怎樣形成的?
Callus formation is triggered by pressure or abrasion.
老繭是由壓力和摩擦而形成。
The heel of your foot as it rubs inside your shoe, or the palm of your hand if you're doing a lot of manual labor are good examples of this.
腳后跟的繭是由其在鞋里摩擦而形成，正如手繭是在大量的勞動(dòng)過程中形成。
While it might feel like a callus is something extra, added to your skin, it's actually just a build-up of what's already there.
盡管看起來(lái)似乎是皮膚上多出的部分，然而事實(shí)是已經(jīng)存在的皮膚角質(zhì)的累積。
Here is our words: your skin has a number of layers of different types of cells.
我們是這么說(shuō)的：皮膚是由若干層不同類型的皮膚構(gòu)成。
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