哪些源数据项可用，哪些不可用？
表达式由源数据项、目标数据项、以及源数据项之间的关系构成，并符合一定表示规则。
The mapping expression composes three parts: Source Data Elements, Target Data Elements, and Relationship among Source Data Elements, the express rules of the three parts being implemented.
数据源中是否有其他可用但没有请求的有趣数据项呢？
Are there other interesting data items that are available in the data sources but have not been requested?
选择profession查询项作为数据项源，并选择OK。
Choose the Profession query item as data item source, and select OK.
单元格的主要作用是展示数据源中的单个数据项。
The job of a cell is to present the content for a single item from your data source object.
获取数据绑定控件从中检索数据项列表的数据源对象。
Gets or sets the ID of the data source control from which the data-bound control retrieves a list of data items.
获取数据绑定控件从中检索数据项列表的数据源对象。
Gets or sets the ID of the data source control from which the data-bound control retrieves a list of data items.
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