They can operate on a single document or a selection of them.
它们可以操作单个文档或者一组文档。
Obviously, this can take longer than updating just a single document.
显然，这个操作花费的时间比只更新单一文档长。
Based on the date and the number, you can easily find any single document.
根据日期和号码，很容易找到任何单个文档。
The next step is to query a set of documents instead of a single document.
下一步是查询一组文档而不是单个文档。
A single document can contain several forms but this element cannot be nested.
一个文档可包含几个表单，但不可以嵌套这个元素。
You can even use it to change a single document.
你甚至可以用它来转换一个单一文件。
A single document may be the subject of more than one review.
一个文档可能是几个评审的对象。
This becomes even more important when multiple team members update a single document, often simultaneously.
如果是团队的多名成员更新同一份文档(常常是同时更新)，这就显得更重要了。
This becomes even more important when multiple team members update a single document, often simultaneously.
如果是团队的多名成员更新同一份文档(常常是同时更新)，这就显得更重要了。
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