positive pressure respirator

例句：

1. 1. The patient was given a positive pressure respirator to help him breathe.
   患者被给予一个正压式呼吸器来帮助他呼吸。
2. 2.The doctor used a positive pressure respirator to treat the patient's respiratory failure.
   医生使用正压式呼吸器治疗患者的呼吸衰竭。
3. 3. In emergencies, positive pressure respirators are often used to provide oxygen to patients in need.
   在紧急情况下，正压式呼吸器通常被用来为需要氧气的患者提供氧气。