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.
绘图法中的地图投影方法可以在平面中表示一个两维的曲面，例如一个标准地图。
Map projection in cartography is a way to present a two-dimensional curved surface on a plane, such as a normal map. Figure 2 shows a Traverse Mercator projection.
本文利用复数表示法，得出从动转子中心作平面一般运动情况下的凸轮廓线的设计方法。
With the help of complex number operation, the author has developed a method for designing the contour of a CAM whose follower keeps a general plane motion.
分别介绍了空间直线与平面在数学及计算机中的表示方法，重点强调空间直线和平面位置关系的判定方法，并介绍了这一方法的应用。
The expression of line and level in three-dimensional space in computer is introduced respectively, laying the emphasis on the method of judging the position relation of line and level.
分别介绍了空间直线与平面在数学及计算机中的表示方法，重点强调空间直线和平面位置关系的判定方法，并介绍了这一方法的应用。
The expression of line and level in three-dimensional space in computer is introduced respectively, laying the emphasis on the method of judging the position relation of line and level.
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