在变量部分中定义全局变量。
The variable section is where most globally defined variables are defined.
每种环境都有一组特定的预定义全局变量。
Each environment brings with it a certain set of predefined global variables.
指定脚本的运行环境。每种环境都有一组特定的预定义全局变量。
Environments - which environments your script is designed to run in. Each environment brings with it a certain set of predefined global variables.
in this global environment.
这里定义了一个全局变量。
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