短语词组短語air motor shaft 氣動馬達軸air r shaft 通風井;風井hot air exhaust shaft 排熱風井mine air return shaft 廻風立井air return shaft 廻風井筒air relief shaft 排氣竪風筒;通風竪井air inlet shaft 進氣道Air draught shaft 自然送風口air hovered shaft 氣浮軸承 返回 air shaft