超集； 扩展集
The base view contains a subset of columns and a superset of rows. 基本视图包含列的子集和行的超集。
These definitions simply generalize the standard notions of arithmetic types and values by introducing a superset called numeric. 这些定义只是通过引用一个名为数字的超集，对标准中的算术类型和算术值进行了泛化。
