The map operation transforms a collection into a new collection by applying a function to each of the elements, as illustrated in Figure 6.
map运算会对每个元素应用一个函数来将一个集合转换成一个新的集合，如图6所示。
The Map operation, written by the user, takes an input pair and produces a set of intermediate key/value pairs.
用户编写的Map操作需要输入并生成一组中间键/值对。
The Map operation, written by the user, takes an input pair and produces a set of intermediate key/value pairs.
用户编写的Map操作需要输入并生成一组中间键/值对。
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