程序员倾向于注释代码块，也许它会需要到。
Programmers tend to comment out blocks of code in case it's needed later.
当你熟悉它时，你的代码看起来好多了，没有不必要的注释代码块。
Whenyou are familiar with it, your code looks a lot nicer without unnecessary blockof commented code.
正如我在注释中指出的，清单1中的第一块代码(第1 - 5行)处理对输入流的语法分析，以构建文档表示。
As I indicate in the comments, the first block of code (lines 1-5) in Listing 1 handles parsing an input stream to build a document representation.
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