The surface generated by a straight line intersecting and moving along a closed plane curve, the directrix, while remaining parallel to a fixed straight line that is not on or parallel to the plane of the directrix.
英
美
- 柱面一條直線(xiàn)與一個(gè)封閉的平面曲線(xiàn)相交及沿著(zhù)平面曲線(xiàn)移動(dòng)所形成的平面，準線(xiàn)則與一個(gè)不在此準線(xiàn)平面上或者不與此準線(xiàn)平面平行的固定直線(xiàn)保持平行
