Passengers are being encouraged to check ahead with their airlines, to arrive an hour earlier than normal and to bring only a single carry-on bag with them.

VOA: standard.2009.12.27

During development of the embryo it goes from being a single cell, the fertilized egg, to being a multi-cellular organism with billions of cells in it.

胚胎的发育,始于一个单一细胞,即受精卵,直到形成一个以十亿计数量的细胞构成的,多细胞有机体

耶鲁公开课 - 生物医学工程探索课程节选

But a char we've seen, a character being a single character.

正如我们看到的，一个字符就是一个单独的字符。

哈佛公开课 - 计算机科学课程节选

What's the metaphysical glue that underlies ? being a single extended-through-time person?

是什么形而上粘质,成为一个贯穿时间的人的基础？

耶鲁公开课 - 死亡课程节选

Most of you have probably at some point or another learned about the cell cycle, or the process of a cell going from being a single cell to being two cells.

大部分人应该或多或少,学过细胞周期,就是细胞,一分为二的过程

耶鲁公开课 - 生物医学工程探索课程节选

Remember, every time we have two electrons that are being shared, that's a single bond.

还记得，每次我们有两个电子被共用，我们就有了一个单键。

麻省理工公开课 - 化学原理课程节选

Think of that the people in a democracy he says "coming together uniting together become like " a single human being with many hands and feet " " and he says "with greater character and mind."

想一下，他说，民主政体中的人民,“连结，统合在一起,变成像是单一的个体，多手多脚“,且如他所说，“含有较广的性格与心智“

耶鲁公开课 - 政治哲学导论课程节选