Right, and just to get a sense of this, let's look at a simple little example, so on your hand-out, you'll see I've got a little piece of code that says assuming I've got one of these points, I want to do things with it, for example I might want to add them together.

这些数组中的一个，你怎么能够知道，它是哪种类型的呢？,你怎么知道它是以笛卡尔坐标,表示的还是以极坐标,形式表示的呢？,你没有可以用来区分的东西，你没有说明这种信息,聚集实际上的意义。

麻省理工公开课 - 计算机科学及编程导论课程节选

And it's talking about the past, about something that you did before,

它用来表示你过去做过的事情，

I used to 课堂 - SpeakingMax英语口语达人

The most important vector is the position vector that tells you where the object is.

最重要的矢量是位置矢量,用来表示物体的位置

耶鲁公开课 - 基础物理课程节选

For a lot of Protestants in the early seventeenth century, the word chastitycould also be used to refer to the state of what could be called married chastity: - married chastity was a type of bodily purity that could be extended -- -- or a spiritual purity as well -- that could be extended even into marriage.

对早期17世纪的新教徒来说，贞节这个词也可以用来,表示婚姻贞节：,婚姻贞节是一种可以延伸的身体上的纯洁-,同样也是一种精神的纯洁-,那种纯洁甚至可以延伸至结婚以后。

耶鲁公开课 - 弥尔顿课程节选

So, for example, if we look at sodium channels, and sodium channels are some of the particularly prevalent ones when we're talking about neurons, if you think about the cell membrane, and this little green cartoon is me trying to show a sodium channel here, and in this case, you can see that it's closed, such that no ions are getting through.

比如，让我们来看一下钠离子通道，钠离子通道是我们会经常遇到的几个之一,在讨论神经元的时候，如果大家想想细胞膜，而这个绿色的小示意图就是我用来表示,钠离子通道的，在这种情况下，大家可以看到它是关闭的，因此没有离子可以通过。

麻省理工公开课 - 化学原理课程节选

Is there a key word like int or char double with which you can represent a 1024-bit value?

有一个像int，char，double这样的关键字,用来表示一个1024位大小的数值呢？

哈佛公开课 - 计算机科学课程节选

It can be an expression of regret for your personal actions.

这可以用来表示你后悔自己所做的事情。

I'm sorry 课堂 - SpeakingMax英语口语达人

Let me is a great pattern to refer to yourself and relationship to other people.

et me句型是用来表示你自己和你与他人关系的绝佳句型。

Let me 课堂 - SpeakingMax英语口语达人

Or you can use it to express something that you've been pondering,

I think”句型也可以用来表示一些你在思考的事情，

I think 课堂 - SpeakingMax英语口语达人

Or if you want to tolerate negative numbers, you've got to sacrifice something.

如果你想也用来表示负数呢？,你不得不拿出一部分来表示。

哈佛公开课 - 计算机科学课程节选

So, this really just means for frequency, it's a frequency label.

你要说米每秒，所以它仅仅是，用来表示频率的，是个频率的标志。

麻省理工公开课 - 化学原理课程节选