When a method marked as conditional is called, the presence or absence of the specified preprocessing symbol determines whether the call is included or omitted.
当调用标记为条件的方法时，指定的预处理符号的存在或不存在决定是否包含或省略此调用。
Is it possible to reference conditional compilation symbol from another project?
它是可能的参考条件编译符号从另一个项目？
Is it possible to reference conditional compilation symbol from another project?
它是可能的参考条件编译符号从另一个项目？
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