然而，解决学校教育所带来的挑战注定是一个国际化的问题，就拿一种交互式数学教学系统“HeyMath!”
Already, some of the solutions to school-teaching challenges are as global as could be.
双向视频教学系统是远程教学的一种新的重要教学手段，它能实现远程交互教学，提高教学质量。
Revesible video frequency teaching system is a new kind of important teaching method of distant teaching. It can realize distant teaching and studying and improve the teaching quality.
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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