自悬浮定向流技术
Flow-levitation technique
自主定向
auto-orientation(Darlington 1963
组合定向阀
combination directional valve
组织定向干细胞
tissue-committed stem cells
tissue committed stem cells
组织定向活检
tissue stereotactic biopsy
钻头的定向切削能力
bit’s directional cutting ability
最佳定向方向
optimal oriented direction
左转定向匝道
turn-left directional ramp