direction ray目标射线directionn.方向；指导；用法说明；趋势；目标；管理directional drilling crossing定向钻穿越direction-finding equipment测向设备direction of counter-strike反突击方向direction probability density方向概率密度direction deviation of a hole孔斜directional communicated well定向井连通directional-distance filter距离方向滤波器direction switching condition方向转换条件directional fractal dimension方向分形维direction-finding apparatus测向仪