pneumal

例句：

1. 1. The lungs are responsible for the exchange of oxygen and carbon dioxide between the body and the environment.
   肺部负责身体与环境之间氧气和二氧化碳的交换。
2. 2. During sleep, the alveoli in the lungs expand to allow more oxygen to enter the bloodstream.
   在睡眠时，肺部的肺泡扩张以允许更多的氧气进入血液。
3. 3. Lung diseases can lead to respiratory failure if not treated promptly.
   如果不及时治疗，肺部疾病可能导致呼吸衰竭。