The next line illustrates the use of the map function.
下一行说明map函数的使用。
This data needs to have the map function applied to it.
这些数据上需要应用map函数。
The first, keys, is a list of keys that were created in the map function.
第一个参数是keys，这是在map函数中创建的键的列表。
The Map function emits each word plus an associated count of occurrences.
map函数发出每个单词附有一个相关的出现次数计数。
The Map function emits each word plus an associated count of occurrences.
map函数发出每个单词附有一个相关的出现次数计数。
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