air cell

例句：

1. 1. The air cell is a type of structure that allows for the exchange of gases between different parts of the body.
   空气细胞是一种结构，允许身体不同部位的气体交换。
2. 2. The air cell is responsible for maintaining the balance of gases in the lungs.
   空气细胞负责维护肺部气体的平衡。
3. 3. The air cell is an important part of the respiratory system, playing a crucial role in the exchange ofoxygen and carbon dioxide.
   空气细胞是呼吸系统的重要组成部分，在氧气和二氧化碳的交换中起着关键作用。