Most cells in your body have two copies of every chromosome and, therefore, two copies of every gene: one from your mother and one from your father.

你体内的大多数细胞每条染色体都有两份拷贝，因此，每个基因也都有两份拷贝：一份来自你的母亲，一份来自你的父亲。

youdao

Two copies of the contract will be sent to you for signature.

合同一式两份，将送交您签署。

《牛津词典》

This was the burglar example where they had two copies of everything.

这是个窃贼的例子，他们什么东西都有两份。

youdao

People have two copies of each gene.

VOA: special.2010.03.23

Right. Now I have two copies of two, but that's why I kept this thing around.

对的，现在我有两份数值，这就是为什么我保持这个东西。

哈佛公开课 - 计算机科学课程节选

This was the burglar example where they had two copies of everything.

也就是那个窃贼的例子,每件东西都有两件。

麻省理工公开课 - 计算机科学及编程导论课程节选

Two copies of the "val" gene makes powerful COMT that mops up the chemicals rapidly.

BBC: Gene controls pain threshold

Both drugs are being tested in patients who have two copies of a genetic mutation called F508del.

FORBES: Personalized Cystic Fibrosis Drugs Get A Booster Shot

The Library of Congress said last month it was aware of only two copies of the photo.

WSJ: Rare 1865 baseball card to be auctioned in Maine