Once again, you should place the static keyword after the visibility modifier.

再次，应将static关键字放在可见度修饰符后。

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Change the visibility modifier of the derived-class method to match the visibility of the base class method.

对派生类方法的可见性修饰符进行修改，使其与基类方法的可见性相匹配。

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To declare a static property, place the keyword static after the visibility modifier, directly in front of the property variable.

要声明静态属性，将关键字static放在可见度修饰符后面，直接位于属性变量前面。

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