查询无效：确保括号完整，自定义查询只包含有效标准数字以及布尔型运算符and、OR和NOT。

Invalid query: make sure parenthesis are balanced and the custom query consists only of valid criteria Numbers and the Boolean operators and, or, and NOT.

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若要在自定义类中重载运算符，您需要在该类中创建具有正确签名的方法。

To overload an operator on a custom class requires creating a method on the class with the correct signature.

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