Blank lines and comments in the configuration file.
配置文件中的空白行和注释。
Blank lines and comments in the configuration file: AppConfig knows about blank lines and comments, and will ignore them.
配置文件中的空白行和注释：AppConfig可以识别空白行和注释，并将忽略它们。
As you can see, the whole thing is only 17 lines long, including comments and blank lines.
可以看到，所有的事情只有17行代码，包括注释和空行。
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