And particularly, we've seen a couple of things called header files.

特别是，我们看到了一些叫做头文件的东西。

And that's when we added, a moment ago, a second header file called CS50.h.

刚才我们添加了第二个头文件CS50.h。

Well, there might very well be other header files.

嗯，很可能还有其他头文件。

Using an extension in Scratch is similar to using a header file in C.

在Scratch中使用扩展名类似于在C中使用头文件。