EJB组件的主键由一个或多个持久性变量组成，对应于数据库中的主键。

The primary key of the EJB component, made up of one or more persisted variables, corresponds to the primary key in the database.

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计量资料是由数值变量组成的、通过测定观察指标数值大小所获得的资料。

Measurement data, which is obtained by measuring the size of numeric value, is consisted of numerical variables.

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由这些变量组成的计数资料必须根据资料设计的特点，进行相应的统计学分析。

Composed of those categorical variables, the enumeration data had to be correspondingly analyzed with special statistical methods on the ground of their design methods.

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