normal line methodperpendicular drop method垂线: perpendicular; vertical; ver ...法: law正垂线法: direct plummet observation垂线: (与另一条直线或平面相垂直的直线) perpendicular; vertical; [数学] vertical line; perpendicular line线法: straight-line method (sl)下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:垂线法，即可在微信中查询翻译
