expiratory gas

例句：

1. 1.The patient was given oxygen to help them breathe.
   病人被给予氧气以帮助他们呼吸。
2. 2. The doctor advised the patient to avoid smoking while they were in the hospital.
   医生建议病人住院期间避免吸烟。
3. 3. The firefighters used a hose to extinguish the flames from the expiratory gas.
   消防员使用水龙带从废气中扑灭火焰。