A subtype can also add more element and attribute declarations to the base type.
子类型也可以向基类型增加更多的元素和属性声明。
Base attribute, whose value is the qualified name of the base data type.
属性，该属性的值为基数据类型的限定名。
Estimates with zero degrees of freedom represent the base (reference) level of an attribute.
估计用自由的零程度表现属性的基础(叁考)水平。
Estimates with zero degrees of freedom represent the base (reference) level of an attribute.
估计用自由的零程度表现属性的基础(叁考)水平。
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