Occasionally, you'll find you need to cancel out units, because, of course, you're always doing unit analysis as you solve your problems, and sometimes you'll need to convert joules to kilogram meters square per second squared.

偶然地，你会发现需要消除单位，因为在解题时,经常要做单位分析，所以有时候需要把,焦耳换做,一千克乘以米的平方除以秒的平方。

麻省理工公开课 - 化学原理课程节选

The week after we implemented the so-called game of 15, this little party favor where you move the numbers up, down, left or right.

到第三周，我们要编一个叫做“15”的游戏，就是经常在派对上玩的,可以把数字上，下，左，右移动的小游戏。

哈佛公开课 - 计算机科学课程节选

Why? Because typically, you're doing that to use it somewhere else in the program.

为什么要这么做呢？因为你经常会在程序中,用到这一点。

麻省理工公开课 - 计算机科学及编程导论课程节选

In my in my area of research, it's common for us to want to process about 100 images a second in order to get real time display. Each image has about a million elements in it. I 've got to process about a half a gig of data a second in order to get anything out of it.

在我们的研究领域内，我们经常要在一秒钟内处理大概,100张图片以获得实时显示,每个图片大概包括了100万像素,因此我必须在1秒内,处理半个G的数据,来获取我想要的。

麻省理工公开课 - 计算机科学及编程导论课程节选