If we touch the hands of the small turtles, it would shrink its head and limbs immediately to Pui (turtle) shell inside.

如果我们用手去碰小乌龟的时候，它会把头和四肢立刻缩到贝(龟)壳里面。

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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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In JIAXIAN city to see Kwok Pui Chun, she was sitting in front of the cutting system JIAXIAN suburbs map.

在佳县城内见到郭佩珍时，她正坐在门前剪制佳县城郊图。

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In JIAXIAN city to see Kwok Pui Chun, she was sitting in front of the cutting system JIAXIAN suburbs map.

在佳县城内见到郭佩珍时，她正坐在门前剪制佳县城郊图。

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