也叫做用户定义的变量 user defined variable
用户定义变量在Environment字段中定义(见图7)。
User defined variables are defined in the Environment field (Figure 7).
此外，不需要为用户发起的脚本包定义环境变量。
In addition, there is no need to define environment variables for the user initiated script package.
用户使用% define (php中的define)语句特别定义的变量。
Variables specifically defined by the user using the % define statement (define in PHP).
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