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。

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.

youdao

点一两份甜点一起吃，顺便来看看你约会对象的喜好。

Order a dessert or two to share and find out your date's preferences.

youdao

这会导致有两份同样的图像。

This resulted in having two copies of the same image.

youdao

I just turned it on literally this morning to start playing and I'm on myself a couple of email lists, one of which had an email this morning saying, "Hey, has anyone tried this, it really kind of sucks."

今天早上我就碰到这样的情况了,我收到了两份邮件单，其中一份有一封邮件说，嗨，有人用过这个了吗，真是糟透了“

哈佛公开课 - 计算机科学课程节选

So you should have gotten two handouts as you came in, and if you didn't, please raise your hand and a TA will come to you and get you that second handout.

因此你们应该都在进来的时候拿到了两份讲义，如果你没有，请举手示意，助教会过去,给你第二份讲义。

麻省理工公开课 - 化学原理课程节选

These are called concept sheets and they're one to two pages of things that you write about what's going on in the class.

你们需要写一份一到两页纸的观点报告,主要写一些与课堂内容有关的事情

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选