Kwok Pui Chun, now 77 years old, hale and hearty.
现年77岁的郭佩珍，精神矍铄。
Standing on the point of interaction design, the paper studies the usability design of the PUI system and its theories and methods etc.
站在交互设计的角度，本文研究了笔式用户界面系统可用性设计的过程及其中运用的原理和方法等。
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.
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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