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但是，在很多情况下，重要的实体是一个记录的一个子集，或者跨多个表，需要通过公共键链接数据。
However, in many cases, an entity of importance is a subset of a record, or spans several tables and requires data to be joined through a common key.
某些数据元素或域本身或它们的组合对于理解整个记录或实体非常关键。
Certain data elements or domains either by themselves or in combination are critical to the understanding of an entire record or entity.
保存在数据存储中的每一条记录，即实体，都需要有一个主键。
Each record saved in the datastore, also called an entity, requires a primary key.
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