Lists the predefined variables available for conditional compilation.
列出条件式编译之可用的已定义变数。
W3Eval has some predefined variables, but it also supports user-defined variables.
W3Eval有一些预定义的变量，不过它也支持用户定义的变量。
Another function of such a script is to set up predefined variables in a consistent way.
这种脚本的另一个功能是以一致的方式设置预定义的变量。
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