范围线英文

你好！地平线horizon 英[həˈraɪzn] 美[həˈraɪzn] n. 地平线; 范围; 界限; 眼界; [例句]A grey smudge appeared on the horizon. That must be Calais, thought Fay一个模糊的灰影出现在地平线上。那里一定是加来，法伊心想。

应该是with points you can make a line; with lines,a plane; with planes,a solid 要是单数前面要加a 要么加the