Systema respiratorium

例句：

1. 1. The doctor diagnosed him with a severe case of pneumonia.
   医生诊断他患有严重的肺炎。
2. 2. The patient was given oxygen to help his respiratory system recover.
   患者被给予氧气帮助他的呼吸系统恢复。
3. 3. The researcher found that the air pollution had a direct impact on the respiratory system.
   研究者发现空气污染直接影响呼吸系统。