当然也有另一种方法，就是用参数方程表示这两条直线，用两条直线的方向向量作外积，从而得到切平面的法向量。

Another way to do it, of course, would provide actually parametric equations of these lines, get vectors along them and then take the cross-product to get the normal vector to the plane.

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以边界元计算为基础，提出正交各向异性平面问题材料参数识别的反分析方法。

Based on the boundary element method, an inverse method is developed to identify the material parameters of orthotropic plane problem.

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并在此基础上通过改变模型参数，使该建模方法同样适用于解决平面多杆机构的运动可靠性问题。

On the basis of it, the method of establishing the mathematical model is also suitable for calculating the reliability of motion of plane multi bar linkages by changing the parameters of the model.

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