有四个等边三角形面的四面体。
她说：“它真可以说是四面的白墙，而你有10平方英尺的房间来布置，由自己来装点”。
"It is literally four white walls and you have a 10 by 10 square foot room to work with, to make your own," she says.
四面三角体模块是有四 个平面的立体模块；
The tetrahedron triangle module is a solid module with four planes;
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