首先，在文件头部我设置了视区。

First, notice that in the head of the document, I set the viewport.

youdao

您可以使用任意一种方法以移植您的文件头部内容。

You can use either method to migrate your document's head content.

youdao

在运行脚本之前，需要编辑脚本文件头部的以下几行，如清单6所示。

Before running the script, you need to edit following lines in its header, as shown in Listing 6.

youdao

Let's go into hi3.c. So again I have some comments up top.

再创建一个文件hi3，c，还是一样，头部有一些注释信息。

哈佛公开课 - 计算机科学课程节选