肺

例句：

1. 1. He coughed up blood after a long illness.
   他长期患病后咳出了血。
2. 2. The doctor advised him to avoid smoking to protect his lungs.
   医生建议他避免吸烟以保护他的肺部。
3. 3.She was diagnosed with pneumonia and required immediate hospitalization.
   她被诊断出患有肺炎，需要立即住院治疗。