可以认为支持闭包就是提供将“代码块”作为第一级对象处理的能力：能够传递、调用和动态创建新的代码块。

You can think of closure support as providing the ability to treat "blocks of code" as first class objects: pass them around, invoke them, and dynamically create new ones.

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要在多维数据集模型的另一个切片上创建分组集，应该创建一个新的分组集，其中至少要包含新切片中每一级的级键属性。

To create a grouping set at another slice of the cube model, create a new grouping set that includes, at a minimum, the level key attributes of each level in the new slice.

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