vapor

例句：

1. 1. The hot air evaporates into the cool night air.
   热空气蒸发成凉爽的夜空。
2. 2. The steam from the kettle rises to fill the room.
   水壶里的蒸汽上升，充满整个房间。
3. 3. The scientist observed the vapor rising from the surface of the lake.
   科学家观察到从湖面上升起的蒸气。