lung governing purification and descending

例句：

1. 1. He had a lung infection and needed to see a doctor immediately.
   他得了肺炎，需要立刻去看医生。
2. 2. The patient's lungs were severely damaged from the accident.
   病人的肺部因事故严重受损。
3. 3. Lung cancer is a leading cause of death worldwide.
   肺癌是全球死亡率最高的癌症。