The reduce method is passed an Iterable whose type will be the type of the (key, value) pairs that are input to it.
对reduce方法传递一个iterable值，它的类型将是输入它的(key,value)对的类型。
The reduce method is passed an Iterable whose type will be the type of the (key, value) pairs that are input to it.
对reduce方法传递一个iterable值，它的类型将是输入它的(key,value)对的类型。
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