When the polymer forms a condensed, well-defined layer closely surrounding the cell, it is called the capsule.

当这些紧紧围绕细菌的的多聚体形成浓集，边界明显的一层时称为荚膜。

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Then, the entity, entirety and entirety set (or polymer) of digital map are defined and the data model of digital map is discussed.

其次，从地图信息结构特点出发，定义了数字地图实体、整体、聚合体，并在此基础上给出了数字地图实体的数据模型。

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