短语词组短语air motor shaft 气动马达轴air r shaft 通风井;风井hot air exhaust shaft 排热风井mine air return shaft 回风立井air return shaft 回风井筒air relief shaft 排气竖风筒;通风竖井air inlet shaft 进气道Air draught shaft 自然送风口air hovered shaft 气浮轴承 返回 air shaft