给三行代码加一行注释，只需要你几秒时间。
It only takes a second to add an additional comment line for each 3 lines of code.
作者为此常常采用的一种技巧是把对于理解当前例子不是必需的代码段用一行注释来代替。
This is often achieved with substituting blocks of code with a single lined comment when such blocks are not essential for the understanding of the current sample.
其他以 # 字符开始的行是注释，执行时将被忽略。
Other lines that start with a hash sign (#) are comments and are ignored by the computer.
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