平行線(xiàn)，平行面如直線(xiàn)或平面等一組平行的幾何圖形之一
One of a set of parallel geometric figures, such as lines or planes.
母點(diǎn)，母線(xiàn)形成一個(gè)幾何圖形的幾何要素，尤指通過(guò)以規定方式運動(dòng)而產(chǎn)生一個(gè)面的一條直線(xiàn)
A geometric element that generates a geometric figure, especially a straight line that generates a surface by moving in a specified fashion.
射影的指定幾何圖形屬性的，以便當這個(gè)圖形經(jīng)受影射時(shí)不發(fā)生變化
Designating a property of a geometric figure that does not vary when the figure undergoes projection.
