它们必须标记为公用并且符合类别介面内的宣告。

They must be marked public and must match the declarations in the class interface.

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任何的类别、结构或介面成员宣告中，如果在型别之前包含无效的修饰词，都将产生此错误。

Any class, struct, or interface member declaration that contains invalid modifiers before the type will generate this error.

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如果继承的介面不是宣告为新类别的一部分，则会由负责宣告的基底类别提供实作。

If the inherited interface is not declared as part of the new class, its implementation is provided by the base class that declared it.

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