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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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。

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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)。

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"An intermediate certificate is essentially a master key that can create certificates for any domain name, " explained security analyst Chester Wisniewski from Sophos in a blogpost about the security lapse.

BBC: Google detects fake website ID certificate threat

After all, the piano is such a welter of machinery: Push a key and before you hear a note, a small lever pushes against an intermediate lever, which pushes a jack, which pushes a roller, which pushes a hammer toward the strings.

NPR: Murray Perahia: Bonding With Bach And Chopin