The revision is the _rev map entry in Listing 15.
修订是清单15 中的 _rev映射条目。
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。
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。
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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