针对这个问题该文基于人机交互中的笔交互技术，设计并实现了一套几何教学系统，并将双向几何约束的相关技术应用于该系统中。
To solve this problem, this paper designs and implements a geometric teaching system based on PUI (Pen User Interface), and applies technique of bidirectional geometrical constraint to this system.
针对这个问题该文基于人机交互中的笔交互技术，设计并实现了一套几何教学系统，并将双向几何约束的相关技术应用于该系统中。
To solve this problem, this paper designs and implements a geometric teaching system based on PUI (Pen User Interface), and applies technique of bidirectional geometrical constraint to this system.
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