A type implements the equality or inequality operator and does not implement the opposite operator.
某类型实现相等运算符或不等运算符，却未实现相反运算符。
There are no circumstances where either equality or inequality is applicable to instances of a type, and the opposite operator is undefined.
不能存在以下情况：相等运算符或不等运算符适用于某类型的实例，却未定义相反运算符。
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