air shrinkage

例句：

1. 1. The air in the room is getting much colder as the day goes on.
   随着一天的进行，房间里的空气变得越来越冷。
2. 2. During the flight, the air pressure changes due to the altitude change.
   飞行过程中，由于海拔变化，气压发生变化。
3. 3. The scientist conducted an experiment to study the effect of air pressure on the expansion of a balloon.
   科学家进行了一个实验，研究气压对气球膨胀的影响。