Let's look at a concrete example: Listing 1 shows a simple XML-based user service profile.
让我们看一个具体的例子：清单1展示了一个简单的基于XML的用户服务配置文件。
2
The tunnel deepening for 1 meter takes one day. Three days more - for concrete casting of the walls and the arch.
隧道加深一米需要1天的时间，而浇铸混凝土墙壁和拱顶需要3天多的时间。
3
Building on the ground we covered in part 1 of this two-part series, this article covers a couple of concrete applications of lex and yacc and discusses some common pitfalls.