> That lets the compiler know that you want to use some actual compiled code from that library.

>，那是告诉编译器我们想要在程序库中,使用一些当前的编译后的代码。

哈佛公开课 - 计算机科学课程节选

So that is a flag that tells the compiler that I want to use or link into my own program code that someone else wrote that lives somewhere else on the system whose moniker is CS50.

所以那是一个标记，用来告诉编译器我想使用,或连接我自己的程序代码到一个叫做CS50的系统中的程序,可能其他人在那个系统写了这些程序。

哈佛公开课 - 计算机科学课程节选