direction ray目标射线directionn.方向；指导；用法说明；趋势；目标；管理direction for school running办学方向direction-adaptive lifting自适应方向提升directional blasting closure定向爆破截流directional send and receive定向发送和接收direction finding changeover探向转换开关direction-finding receiver测向接收机direction-selective neuron方向选择性神经元Directional lateral drilling定向侧钻directional impulse response方向性脉冲响应direction-listening device声波定向器