The Russian Doll design is the least extensible since three out of four types are locally defined and therefore inaccessible to anything else.

俄罗斯娃娃式设计是最不易扩展的，因为四个类型中有三个是局部定义的，所以它们不能被任何其它组件访问。

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The Oracle database is therefore seen as a collection of three file types.

因此，可以把Oracle数据库看作包含三种文件的集合。

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As mentioned before, events are characterized by the two contextual dimensions product and location. Therefore, a user can specify three types of disclosure rules in the Security Policy editor.

正如前面提到的，事件按照两个上下文维(产品和位置)来区分。

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