人体皮肤由于劳动过程长期摩擦造成皮肤表皮细胞坏死而形成的，主要出现于手掌、足掌等部位。
他的双手由于多年的空手道练习，粗糙而布满老茧。
His hands were rough and callused, from years of karate practice.
鱼疗是一种美体方式，主要做法是将双脚浸在有墨头鱼游弋的水池中，让这些小鱼啃食除去足部的死皮和老茧。
Fish pedicure is a beauty treatment that involves immersing the feet in a tank of water containing Garra rufu fish, which nibble off dead and thickened skin.
你们真该看看我脚上的那三个老茧。
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