单词：plane curve
plane curve的用法和样例：
例句
- Please tell me what the plane curve means.请告诉我这条平面曲线是什么意思。
- A plane curve formed by the locusof points equidistant from a fixed line and a fixed point not on the line.抛物线到一固定直线和不在直线上某一固定点等距的点的轨迹所形成的平面曲线。
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