So it's a useful way of not quite knowing in advance what you want to put in a string, but being able to create strings, phrases, sentences, dynamically.

这是一个很有用的方法，如果你之前不是很了解,在句子中要加入什么，但是这个方法可以,动态地创建字符串，短语，句子。

哈佛公开课 - 计算机科学课程节选

How would you have had the great Greek playwrights, they would argue, without the system, the world the Greeks were able to create with the Helots?

还有伟大的古希腊戏剧家是怎样来的,没有这个制度,希腊人怎能用奴隶创造昔日的繁荣

耶鲁公开课 - 美国内战与重建课程节选

But there's actually hidden in there an important element, and that is, when I create an instance, I have to be able to get access to the things that characterize that instance.

也就是，当我创建了一个实例,我应该能够获得那些特性化，这个实例的东西，我的意思不是说它们是想法,或者情绪之类的。

麻省理工公开课 - 计算机科学及编程导论课程节选

The first step is we had to be able to take this circular DNA and cut it to create a site for our new gene to be added.

第一步是切割环形DNA,以创造出一个整合新基因的位点

耶鲁公开课 - 生物医学工程探索课程节选