外键不仅具有标识记录的标识符，而且还具有标识表的一个类型。

The foreign key has not only an identifier to identify a record, but also a type to identify the table.

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设置了四个字段来标识记录的状况(status)、日期、状态(state)和内容类型。

Four fields were set up to identify the status, date, state, and content type of the record. Following is the portion of the agent that flagged the content.

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因为同步变量使用他们自己内部的标识记录脏数据状态，在属性设置函数中设置脏位会引起递归调用问题。

Because SyncVars use properties internally to mark themselves as dirty, setting them dirty inside property functions could lead to recursion problems.

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