直线zhíxiàn 1.一个点在平面或空间沿着一定方向和其相反方向运动的轨迹; 不弯曲的线。{straight line; track left by a dot moving on a surface or in a space in certain direction and the opposite} 2.指直接的或没有曲折起伏的{direct; steep; sharp (rise or fall)}: ～电话{direct-dial telephone}|～运输{direct transport}|～联系{direct connection}|～上升。{rise sharply}