Well, that's because it's actually not a gross constituent unit in a semiotic system, right?

哈哈，这是因为,红灯不是这一符号系统的一个完整单元？

耶鲁公开课 - 文学理论导论课程节选

So, what you have are small, poor, weak units, and that's a miserable situation.

我们所看到的是微小的,贫穷的,虚弱的小单元,这是一种悲惨的境地

耶鲁公开课 - 古希腊历史简介课程节选

What we're really getting at is the idea of saying I want to have a way of grouping together information into units that make sense. So I can go back to one of those topics we had at the beginning, which is the idea of abstraction, that I can create one of those units as a simple entity, bury away the details and write really modular code.

组合成为有意义的单元,那么这就让我们回到,一开始讲的话题之一了,这就是抽象的概念,也就是我可以以一个简单的，实体的形式创建这样的一个单元，把具体实现隐藏然后写一些,真正模块化的代码,我们在以后的课程中。

麻省理工公开课 - 计算机科学及编程导论课程节选