呼吸作用

例句：

1. 1. The lungs are responsible for the process of breathing.
   肺部负责呼吸过程。
2. 2. Breathing is essential for survival.
   呼吸对于生存至关重要。
3. 3. During sleep, the body undergoes a state of respiration.
   在睡眠期间，身体经历一种呼吸状态。