It cannot contain static members.
它不能包含静态成员。
Is it poor design to declare a class abstract because it only has static members?
它是糟糕设计声明一个抽象类，因为它只有静态成员?。
However, static members cannot see any instance variables unless they define that instance.
然而，静态成员不能看到任何实例变量，除非它们定义实例。
Class members of this kind are known as static.
这种类成员叫做静态成员。
Class members of this kind are known as static.
这种类成员叫做静态成员。
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