The accessibility domain of a nested type never exceeds that of the containing type.
嵌套类型的可访问域决不能超出包含类型的可访问域。
Which is determined by both the declared accessibility of the member and the accessibility domain of the immediately containing type.
该域是由已声明的成员可访问性和直接包含类型的可访问域这二者共同确定的。
Either the type of the argument to be converted, or the type of the result of the conversion, but not both, must be the containing type.
在要转换的型别引数或转换所产生的型别中,必须有一个是包含型别,但不能两者都是。
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