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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Focusing on the "Farmer-Citizenization" problem, this paper analyzes factors of barriers to farmer's identity conversion and puts out the corresponding methodologies.

本文针对农民的市民化问题，分析了阻碍农民身份转换的因素，提出促进农民身份转变的办法和措施。

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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。

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