If you're writing a one line function, whose sole purpose in life is addition, and, clearly, this is about addition, well, then it's, in fact, A reasonable to use a shorter symbol like A, but I do have to specify it's type.

如果你在写一个一行的函数，它唯一的目的是,做加法，显然这是关于加法的，好的，实际上，用一个短的标识符是合理的，像，但是我必须指明它的类型。

哈佛公开课 - 计算机科学课程节选

You have to sort of, you know, put everything in the line, and take your whole life in the next couple of years,

你必须在接下来的两年里对你的人生有一个规划，

要想成为事业家 - SpeakingMax英语口语达人