Set Key Label to a value of your choice.

将密钥标签设置为您所选的值。

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Then when a value is set, the key is removed from the database and a new record is added with the updated value.

在设置一个值后，键就从数据库中移除掉，并添加一条具有更新过的值的新记录。

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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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Any document can contain any set of keys, and any key can be associated with an arbitrarily complex value that is itself a JSON document.

FORBES: What You Need to Know About NoSQL Databases