你可以选择一个图层或者某些图层，通过用这种方法，仅显示那些层的属性。
You can use this by selecting one layer, or certain layers to show the properties for those layers only.
用某种分类方法，通过变更这些属性，市场研究人员可以合理的精确度测量每一属性值多少钱。
By varying these attributes in a systematic way market researchers can measure with reasonable precision how much each trait is worth.
任何连接，甚至更复杂的查询，都可以用同样的方法通过将递归源的组成放入一个CTE中来表达。
Any joins, or even more complex queries, can easily be expressed in the same way by simply pushing the composition of the source for the recursion into a CTE.
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