vapour effects

例句：

1. 1.The hot air rises and turns into vapour.
   热空气上升变成水蒸气。
2. 2.The vapour from the boiling water cooled down quickly.
   沸腾的水蒸气很快冷却下来。
3. 3. The vapour was so thick that it obscured the moonlight.
   水蒸气太浓了，以至于遮蔽了月光。