precipitable water vapor

例句：

1. 1.The air is so dry that it can be precipitable water vapor.
   空气如此干燥以至于它可以成为可冷凝水汽。
2. 2.In the early morning, the temperature drops significantly, making the air precipitable water vapor.
   清晨时分，温度骤降，使得空气中的可冷凝水汽变得明显。
3. 3.The scientist observed the formation of precipitable water vapor in the atmosphere during the experiment.
   科学家在实验中观察到了大气中可冷凝水汽的形成。