As with any call, an argument might match its parameter either because the types match exactly or because there is a conversion from the argument type to the type of the parameter.

与任意函数调用一样，实参必须与它的形参匹配，它们的类型要么精确匹配，要么实参类型能够转换为形参类型。

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A constructor that can be called with a single argument defines an implicit conversion from the parameter type to the class type.

可以用单个实参来调用的构造函数定义了从形参类型到该类类型的一个隐式转换。

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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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