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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At a spring festival gathering in February, the Hong Kong Pui Ching Alumni Association ordered a 10-course meal but opted to replace the shark's fin soup with a chicken, fish belly and abalone soup.

BBC: Hong Kong shark fin trade declines