It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.
从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。
It is called Equilateral triangle that a triangle has equal legs.
三条边都相等的三角形叫做等边三角形。
The equilateral pyramid shape allows it to occupy corners of rooms and desks.
正三角体形状让它轻易贴合墙角、桌面。
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