默认属性组合框为数据绑定设置控件的主要属性。
The Default attribute combo box sets the primary attribute on the control for data binding.
每个属性具有自己的验证规则，另外还有关于如何处理属性组合的规则。
Each attribute has its own validation rules, and there are also rules about how combinations of attributes are handled.
随着维度数目的增加，立方体变得更稀疏，即表示某些属性组合的多个单元是空的，没有集合的数据。
As the number of dimensions increases, the cube becomes sparser-that is, many cells representing specific attribute combinations are empty, containing no aggregated data.
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