... implementation inheritance 实现继承 implicit reference conversion 间接引用转换 indirect superclass 间接超类 ...
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For reference types, an implicit conversion always exists from a class to any one of its direct or indirect base classes or interfaces.
对于引用类型，隐式转换始终存在于从一个类转换为该类的任何一个直接或间接的基类或接口的情况。
When a constraint is applied to a generic type parameter, an implicit identity or reference conversion must exist from the concrete argument to the type of the constraint.
在将某一约束应用于泛型类型参数时，必须存在从具体参数到该约束类型的隐式标识或引用转换。
If you own the class, you can remove the constraint or else do something to enable an implicit reference or identity conversion.
如果您拥有类，则可移除约束或执行某一操作以启用隐式引用或标识转换。
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