关系实例（relation instance）：对应于程序设计语言中类型变量的概念。超码（superkey）：一个或者多个属性的集合，这些属性可以使我们在一个关系中唯一的标识...
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relation instance
关系实例
以上为机器翻译结果，长、整句建议使用 人工翻译 。
For instance, put volume rose in relation to calls for both indexes and equities.
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Again, these gestures are organized conceptually, no ordered (for instance) by how they are presented in Gmail or in relation to the CRUD acronym.
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