created sense approved 准线/準線 · zhǔnxiàn · directrix
准线 / 準線
zhǔnxiàn
directrix
the fixed line used in the definition of a conic section such as a parabola
抛物线上的点到焦点的距离等于其到准线的距离。
created sense approved 准线/準線 · zhǔnxiàn · guide line
准线 / 準線
zhǔnxiàn
guide line
a reference line used for alignment or as a guide in construction or measurement
施工人员在墙面上划出准线以确保瓷砖铺设整齐。
noun