acinus unit of lung

例句：

1. 1. The lungs are responsible for filtering and oxygenating the air we breathe.
   肺部负责过滤和氧气化我们呼吸的空气。
2. 2. The doctor advised him to avoid smoking to prevent lung damage.
   医生建议他避免吸烟以防止肺部损伤。
3. 3. During his recovery, he had to learn to breathe through his nose instead of his mouth.
   在他康复期间，他不得不学会通过鼻子呼吸而不是嘴巴呼吸。