指甲的生长从根基处开始，那里可以产生形成甲体的细胞。
Nail growth begins at the root, which produces the cells that form the nail body.
当这些老化的细胞失去和根基的联系时，它们便形成了甲体，此时它们已经死亡。
When these cells lose contact with the root and form the nail body, they die.
当这些老化的细胞失去和根基的联系时，它们便形成了甲体，此时它们已经死亡。
When these cells lose contact with the root and form the nail body, they die.
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