回风道: bleeder回风洞: return opening回风机: return air fan; return fan回风井: return air shaft回风口: air outlet; return air inlet回风流: return current回风扇: circulating fan回风巷: return airway地面回风口: floor grille二次回风: secondary return air副回风煤巷: air endway; airendway回风百分比: percentage of return air回风百叶: return air flame plate回风苍道: return-air course回风方式: air return method; air return mode回风格栅: air return grille回风隔间: return compartment回风管道: return air duct回风花板: return air perforated plate回风进口: return air inlet回风开口: return air opening回风平巷: tail gate回风竖管: return air riser回风竖井: return shaft回峰落雁剑谱: comebacksword回飞棒星云: boomerang nebula