lungs

例句：

1. 1. He has a weak cough and his lungs feel heavy.
   他咳嗽无力，肺部感觉沉重。
2. 2. The doctor advised him to take deep breaths and exercise regularly to strengthen his lungs.
   医生建议他深呼吸并定期锻炼来增强肺部。
3. 3. She was diagnosed with pneumonia and had to stay in bed for several weeks, whichweakened her lungs.
   她被诊断出患有肺炎，不得不卧床数周，这使她的肺部变得虚弱。