lubber line

常见例句

Based on the geometry characteristics of Bertrand surfaces, the complicated surface conjugation issue can be discussed with their directrix line.
基於白川德曲麪的幾何特征，將複襍的曲麪共軛問題歸結到準線上來討論。
The surface generated by a straight line,the generator,passing through a fixed point,the vertex,and moving along a fixed curve,the directrix.
錐麪由一條直線，即母線，通過一固定點，即頂點，沿一給定曲線，即準線，連續移動而産生的平麪。