More formally, sets contain no pair of elements e1 and e2 such that e1.equals (e2), and at most one null element.
更准确地说，set不包含成对的e1和e2元素，因此如果e1 . equals (e2)，那么最多包含一个null元素。
Adding elements to the map is a little more involved than adding to a set, only because we have to put each pair of elements separately.
向映射表添加元素要比向集添加元素更加棘手一些，只是因为我们不得不单独put每一对元素。
Supercomputers have huge storage capacity and can operate in parallel on corresponding elements of arrays of Numbers rather than on one pair of elements at a time.
超级计算机具有巨大的贮存容量，能够同时处理大批的数字元素而不是每次处理一对元素。
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