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。
System security modules, map operation modules and data management modules are included in this software.
该软件包含了系统安全模块、地图操作模块、数据管理模块。
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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