型别参数和条件约束的规则有几个泛型类别行为含意，尤其与继承和成员存取范围有关。
The rules for type parameters and constraints have several implications for generic class behavior, especially regarding inheritance and member accessibility.
型别参数不能当做介面方法的泛型条件约束使用。
The type parameter is not used as a generic constraint for the interface methods.
型别参数不能当做介面方法的泛型条件约束使用。
The type parameter is not used as a generic constraint for the interface methods.
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