多态性是面向对象语言中继封装，继承之后第三个基本特征。

Polymorphism is the third essential feature of an object-oriented programming language, after data abstraction and inheritance.

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技术间断具有三个基本特征：利益隐蔽性、思维锁定性和市场破坏性。

Technology discontinuity has three basic characteristics, including concealing interest, locked thoughts and market destroy.

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空间、属性、时间是地理现象的三个基本特征或地理信息系统数据库的三种基本数据成分。

Space, thematic attribute and time are the three basic characteristics of geographical phenomena or the essential data types of GIS database.

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