短語詞組短語ventilation windows opening model 開窗模型natural ventilation opening area 自然通風(fēng)進(jìn)風(fēng)面積main ventilation opening 主通風(fēng)口natural ventilation through large opening 大開口自然通風(fēng)opening for ventilation 通風(fēng)口The opening lung ventilation 肺開放通氣 返回 ventilation opening