锌

A white kitchen may seem difficult to keep clean but it's easy because it bleaches.

白色的厨房让人感觉很难保持乾净，但事实上很简单，因为可以漂白。

An organism or cell having two sets of chromosomes or twice the haploid number.

有两套染色体或者是单倍体两倍的数目染色体的细胞或有机体。