plane parametric curve 平面参数曲线
plane parametric curves 平面参数曲线
parametric plane 参数平面
parametric plane graph 参数平面图
So, you won't need to know about parametric descriptions of planes on a final, but if you really wanted to, you would think of defining a point on a plane as starting from some given point.
在期末考试中，是用不上两个参数，表示来处理平面的，但如果你一定要用，可以考虑，给定平面上的一个起点。
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.
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。
From commonly used equation of calculating plane figure quadrature, formulas of calculating plane figure quadrature by applying curve parametric equation can be deduced.
从由曲线普通方程求平面图形面积的公式出发推出在各种情形下由曲线参数方程求平面图形面积的公式。
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