为了找到带法向量的面元，我就取这两个的叉积。

To find the surface element together with a normal vector, I would just take the cross-product between these guys.

youdao

运用输入输出轴两轴线的向量叉积求出了联轴器夹角方程序。

And then, the expression of the fluctuation of the joint Angle was derived from the cross product of the centerlines of the input and output shafts.

youdao