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这是平面法向量，和沿直线向量的点积。
It's the dot product between the normal vector of a plane and the vector along the line.
本文介绍了实现几何构型的一个行之有效的方法——有向平面法。
This paper describes the method of the directional plane, an effective method to realize the geometrical construction.
用相平面法分析螺旋线平衡的稳定性，导出解析形式的稳定性条件。
The stability of the helical equilibrium is analyzed with phase plane method, and an analytical criterion of stability is revealed.
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