Vertical Drop Line垂线图
hook vertical stroke line吊钩垂直线
vertical dashed line垂直破线
vertical retrace line场逆程线;[电子] 垂直回描线
vertical main line system垂直干线子系统
vertical drainage line竖向排水体
vertical-line method垂线法
vertical epipolar line[测] [摄] 垂核线
vertical center line illusion垂直中线错觉