So I could -- and the hint here is that looks like you probably do want to use CS50's library because I've included the so-called header file for it.

所以我可以--这里的提示看起来好像,你可能的确想使用CS50的函数库,因为我包含了所谓的头文件。

哈佛公开课 - 计算机科学课程节选