Return a single instance of an aggregation object.
返回聚合对象的单一实例。
It then creates a single data feed from this aggregation.
然后从这种聚合中创建单独的数据提要。
An aggregation operation computes a single value from a collection of values.
聚合运算从值集合计算单个值。
An aggregation operation computes a single value from a collection of values.
聚合运算从值集合计算单个值。
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