时差N小时 你的手上有老茧吗?(下)

（单词翻译）

The outermost¹ is a layer of hardened, dead cells.

表层是一些坏死的硬细胞，

This top layer is usually about twenty-five cells thick, and it constantly replaces itself as the outermost cells flake² off to be replaced by new hardened, dead cells underneath³.

通常有25个细胞那么厚，表层细胞不断的脱落，取而代之的是下层硬的坏死细胞，由此而完成自我更替过程。

If your skin is subject to an unusual amount of friction⁴, this layer of dead cells increases.

假如皮肤受到不寻常量的摩擦，这层坏死细胞将会增加，

New dead cells are added faster than the old ones slough⁵ away.

新的坏死细胞增长速度比旧细胞脱落的速度快，

This can build up the outer layer from twenty-five cells thick to over a hundred cells thick.

这就致使皮肤表层的厚度增加到100个细胞那么厚，

You've grown a callus.

由此，老茧便形成。

While calluses are generally useful, if the process continues unchecked a callus can thicken into a cone-shaped structure called a corn.

虽然一般来讲，茧是有益的，但如不控制其过程，老茧厚度就会增加到被称作鸡眼的锥形结构，

These super calluses can be quite painful, and may require the attention of a doctor.

那样就会很疼，甚至需要去看医生。