获取一个值，该值指示某一属性是否表示基础数据中的标识字段。
Gets a value indicating whether a property is in the primary key in the underlying data.
概念模型中的关联是一些属性表示基础数据库中的主键列和外键列的类型。
Associations in the conceptual model are types whose properties represent primary and foreign key columns in the underlying database.
但专家们表示，要想获得成功，企业的基础知识应该包括 P，即“政治”，就像“办公室政治”一样。
But when it comes to getting ahead, experts say, the ABCs of business should include a P, for politics, as in office politics.
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