Interface driver, constraint, and timing rules, modeled using interaction or sequence diagrams.

接口驱动器、约束和计时规则，通过交互或时序图进行建模。

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ConstraintValidator: This is the interface implemented by a constraint validation implementation.

ConstraintValidator：这是一个接口，具体的约束验证类需要实现该接口。

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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。

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