易混淆的单词： XX

When it comes to sex chromosomes , women are xx and men are xy .

就性染色体而言，女性为xx，男性为xy。

An xy combination will become a boy , while an xx combination will be a girl .

xy染色体的结合会生出男孩，而xx染色体的结合会生出女孩。

Your call to los angeles lasted xx minutes . It will cost xx u. s.dollars .

您打到洛杉矶的电话持续了xx分钟，费用是xx美元.

In mammals , females are xx while males are xy so a woman should never be able to provide the necessary y chromosome genes to produce a son .

在哺乳动物中，雌性的性染色体是xx而雄性的是xy所以一个女人是绝不可能产生男性不可缺少的y染色体基因而生育男孩的。

Since men die , on average , five years earlier than women , those much bemoaned visits to the doctor for a routine physical must play at least a minimal role in the difference between xx and xy longevity .

一般来说，男人会比女人早死五年，除了xx和xy染色体的寿命差异外，没有去看医生做例行检查至少有一部分原因。