What do these elements is the basic geometric figure like cube, spheroid and pyramid type.

这些元素是什么呢，是基本的几何图形像立方体，球体和金字塔型。

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Designs and usage of frame geometric figure sketch teaching tools play a very important role in the basic sketch teaching.

框架式几何形体写生教具的设计与使用在基础素描教学中对提高教学效果可发挥其特殊的功能。

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