1. 經(jīng)線，緯線，經(jīng)緯度地圖或地球儀上的經(jīng)緯線或經(jīng)緯度
   A degree or circle of longitude or latitude drawn on a map or globe.
2. 緯線，緯度圈與赤道平面平行且環(huán)繞地球用來表明緯度高低的許多假想線中的任意一條
   Any of the imaginary lines representing degrees of latitude that encircle the earth parallel to the plane of the equator.
3. （天球的）回歸線代表太陽經(jīng)過的最北視界線與最南視界線的兩條相應(yīng)的天球緯線
   Either of two corresponding parallels of celestial latitude that are the limits of the apparent northern and southern passages of the sun.

線的英語翻譯：