然后，清单6使用新定义的枚举作为一个成员变量的类型。

Then, Listing 6 USES the new enumeration as the type for the member variable.

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用以前定义过的类型建立一个新的枚举(grade)之后，您就可以像使用其他成员变量一样使用它了。

By creating a new enumeration (grade) of the previously defined type, you can then use it like any other member variable.

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翻译单元中只能有任何变量，函数，类类型，枚举类型或模板的唯一定义。

No translation unit shall contain more than one definition of any variable, function, class type, enumeration type or template.

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