The revision is the _rev map entry in Listing 15.

修订是 清单 15 中的 _rev 映射条目。

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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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We'll take each one apart and turn it into its own Map entry.

我们将每个元素拆开，将它转换成各自的 Map 条目。

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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.

FORBES: Magazine Article