有了螺旋锥法，很快就能得出方向，通过运用右手螺旋法则。
But I immediately have the direction by using the corkscrew rule.
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.
法向圆弧螺旋锥齿轮传动是一种新的锥齿轮传动形式。
The normal arc spiral bevel gears is a new type of transmission pair.
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