多重集:一个数学上的概念,表示了一种从集合中元素到出现次数只见的映射关系。
A mathematical entity that represents a mapping between the elements of a set and the number of times they appear.
如果你对数学上多重集的概念有所了解,就会知道计数器是一种对多重集的表示方式。
If you are familiar with the mathematical idea of a multiset, a Counter is a natural way to represent a multiset.
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