短語詞組短語directed -Line of Sight 對(duì)準(zhǔn)視線鏈路directed line segment [數(shù)]有向線段;有向線段directed line graph 有向線圖directed line objects 有向線對(duì)象initial amplitude directed line 起始方向線initial directed line [數(shù)]起始方向線 返回 directed line