The advantage of MapReduce is that it allows for the distributed processing of the map and reduction operations.
MapReduce的优点是它允许对映射和缩减操作进行分布式处理。
Map and reduce are named after functions in functional programming but provide the core capability for data reduction.
map（映射） 和 reduce（缩减） 源自函数式编程中的函数名，但是这个应用程序的核心功能是数据缩减。
Not only are mapping and reduction amenable to parallelization, but the map and reduce operations can be combined into a single parallel pass, which is even more efficient.
不仅映射和减法支持并行化，映射和减法运算也可结合到单个并行循环中，这样效率更高。
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