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。
Map, written by a user of the MapReduce library, takes an input pair and produces a set of intermediate key/value pairs.
MapReduce库的用户指定一个Map函数，通过这个函数接收key/value对，然后产生一系列的中间key/value对。
A reduce function then processes those intermediate key-value pairs, merging the values for the associated keys (see Figure 1).
然后reduce函数会处理这些中间键值对，并合并相关键的值(请参考图1)。
The MapReduce library groups together all intermediate values associated with the same intermediate key I and passes them to the reduce function.
MapReduce库把所有具有相同key的中间对组合起来，传递到reduce函数。
The MapReduce library groups together all intermediate values associated with the same intermediate key I and passes them to the reduce function.
MapReduce库把所有具有相同key的中间对组合起来，传递到reduce函数。
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