Otherwise, it would be time-consuming to map each data entry from one source data system to another.

否则，将每个数据条目从一个源数据系统映射到另一个源数据系统将非常耗时。

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Copy these lists into a map with each list entry identified by the first word (the key) of the list.

将这些列表复制到一个映射且使用列表的第一个单词(键)标识每个列表条目。

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The function in Listing 20 returns a vector of vectors. This is because each document could generate zero to many map entries, and each map entry is represented as a vector.

清单 20 中的函数返回矢量的矢量，这是因为每个文档都可能生成零到多个映射条目，而每个映射条目都被表示为一个矢量。

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Next to each address book entry is an icon that when selected will cause the unit to draw a map from your current location to the address given in the address book.

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