vapour flow

例句：

1. 1. The hot air rises and forms a vapour flow over the city.
   热空气上升，形成了城市上空的蒸气流动。
2. 2. The scientist observed the vapour flow as it passed through the laboratory.
   科学家观察了蒸气流动穿过实验室的过程。
3. 3. The vapour flow was responsible for the cooling effect of the room.
   蒸气流动负责房间的冷却效果。