尝试每一天保持有两份的摄入。

Try to keep two servings per day.

youdao

他们发现，那些每天食用四份乳制品的女性，患浆液性卵巢癌的几率比那些每天食用少于两份的要高出两倍。

The researchers found women who consumed more than four servings of dairy products a day had twice the risk of serous ovarian cancer than women who had fewer than two.

youdao

该文本的两份十四世纪的抄本仍然存世。

Two fourteenth-century manuscripts of this text are still extant.

《柯林斯英汉双解大词典》

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