方体，字道坤，一字茶山。安徽绩溪人。
四方体可以用塑料做成。
提出了一种新的二维混沌映射—平面方体上的帐篷映射，并用于流密码的构造。
In this paper, a new planar chaos map is presented which is tent map on square, and it is applied in stream cipher.
前面六个是平面图形，后面三个是立体图形。今天我们学习长方体、方体的认识。
The first six shapes are plane figures, and the last three shapes are solid figures. Today we'll learn about cuboids and cubes.
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