The scale factor can be determined by measuring the rotation angle.
通过测定旋转角度，可以确定比例因子。
2
Concretely, this curl gives you the angular velocity of the rotation, well, with a factor two but that doesn't matter, and the axis of rotation, the direction of the axis of rotation.
它给出了这个旋转的角速率，有一个因子2，但没关系，给出了旋转轴，和旋转轴的方向。
3
The diameter of actual tangent circle is an important parameter for safety of boiler, the residual rotation is the key factor of flue gas temperature deviation at furnace exit.