这个单位已附属于一个大的部门，不再作为一个实体独立存在。

The unit has become part of a larger department and no longer exists as a separate entity.

《牛津词典》

一个单位可包含多个部门。

A unit can have multiple departments.

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或者，我们也可以决定将多个部门组合到一个XML文档中，例如，将属于同一个单位的部门放入一个XML文档中(粗粒度)。

Alternatively, we could have decided to combine multiple or many departments into a single XML document, e.g. all those that belong to one unit (coarse granularity).

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