Carbon intensity is defined as the amount of greenhouse gases emitted for each unit of nation income.

VOA: standard.2009.11.26

Because usually it doesn't work. And so one of the things that I think is very important is to always begin by testing each unit.

因此我认为非常重要的一件事情,就是开始测试的时候先对,每个独立单元进行测试。

麻省理工公开课 - 计算机科学及编程导论课程节选

There's unit testing, where we validate each piece of the program independently.

一种是单元测试，也就是,分别验证程序中的每一个独立部分。

麻省理工公开课 - 计算机科学及编程导论课程节选

We have the convention of music of writing this symbol indicating the beat-carrying unit of four so I'm writing a four underneath each of these.

我们有一个约定俗成的书写格式,来表示四拍一单元,所以我在每行这里的下面写上一个四

耶鲁公开课 - 聆听音乐课程节选