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.

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。

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A common format for storing data record in transient process is defined in transient data transformation standard (COMTRADE).

暂态数据转换标准(COM trade)格式定义了一个存储暂态过程数据记录的通用格式。

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A set of seismometers whose output is sent to a common data channel to record a seismic trace. A large group is known as a patch.

一组地震仪，其输出传送到共用的数据通道来记录地震道。一个大规模的组合被称为大面积组合。

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