If it is not defined, it expands to a declaration of the GUID without initializing it.

如果没有定义，它扩展为声明GUID，而不用初始化它。

youdao

If it is not defined, it expands to a declaration of the GUID without initializing it.

如果没有定义，它扩展为声明GUID，而不用初始化它。

youdao