direction key方向键directionn.方向；指导；用法说明；趋势；目标；管理direction sense movement定向性运动directional filter banks方向滤波器组direction control switch换向开关direction-finding site测向场direction-of-arrival波达方向估计direction finding system测向系统direction of translation迁移方向directional simple loops有向简单回路directional compensation方向补偿, 方向调整directional interlocking方向联锁法