水蒸汽

例句：

1. 1. The hot summer day made the air feel heavy with water vapor.
   炎热的夏天让空气感觉充满了水汽。
2. 2. The steam from boiling water rises up and fills the room.
   沸腾的水产生的蒸汽上升并充满房间。
3. 3. The scientist observed the water vapor rising from a boiling pot.
   科学家观察到从煮沸的锅中升起的水汽。