Database design is reasonable, this requires database in the design to ensure the consistency of the data, reasonable redundancy, rational choice data type, data storage standardized.
数据库设计合理，这就要求数据库在设计时要保证数据的一致性、合理冗余、合理选择数据类型、数据存储规范化。
Choice of a similarity measure depends on the type of data present and your testing.
应该根据数据和测试类型来选择相似度度量。
The eventual return type is not specified by any of the asynchronous service interfaces or implementation classes, leaving the return type your choice, which can be any serializable data type.
最终返回类型不通过任意异步服务接口或实现类指定，允许您选择任意可序列化的返回数据类型。
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