"螺旋运动"是个多义词，它可以指螺旋运动（物理名词）,螺旋运动（数学名词）。
还有一个问题：在与恒星相撞之前，是什么阻止了这颗行星继续螺旋运动？
Another question remains: what prevents the planet from continuing its spiral until it collides with the star?
当一个带电微粒在磁场中时，它会倾向于沿着磁力线螺旋运动。
When a charged particle is in a magnetic field, it tends to travel along that field's lines of force, spiralling as it goes.
文中提出的螺旋运动方程对闭式运动链，即空间机构同样适用。
The screw motion equation presented is also suitable for closed chains, i. e. spatial mechanisms.
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