Nail growth begins at the root, which produces the cells that form the nail body.
指甲的生长从根基处开始，那里可以产生形成甲体的细胞。
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。
The number of chromosomes in the root tip cells was observed.
对主栽品种的根尖细胞染色体数进行了观察；
Studied on chromosome damage in cells of broad bean root tip.
对照射后蚕豆根尖下细胞中的染色体损伤情况进行了研究。
Studied on chromosome damage in cells of broad bean root tip.
对照射后蚕豆根尖下细胞中的染色体损伤情况进行了研究。
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