这有一条平面曲线和一个向量场。

I have a curve in the plane and I have a vector field.

有一条平面曲线和这个平面上的向量场。

Let's say that I have a plane curve and a vector field in the plane.

数控加工中，平面曲线的圆弧插补前，先要在曲线上取节点。

In NC machining, the points must be obtained from plane curve before it is interpolated by arc.

由完全相交的一个圆锥体和一个平面的交集所形成的闭合的平面曲线。

A closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it.

得到了框架结构稳定与不稳定时的位移时程曲线、滞回曲线、相平面曲线及能量时程曲线。

Time history curves of displacement, hysteretic curves of restoring force, phase-plane trajectory curves, time history curves of energy have been obtained.