identifier declaration [计] 标识符说明
declaration of identifier [计] 标识符的说明
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For a global declaration, you need to specify its type (that is, class name) and the identifier you want to use to refer to it (that is, variable name).
对于global声明，需要指定它的类型(即类名)和想要用于引用它的标识符(即变量名)。
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