vapour

/vapour/

a visible suspension in the air of particles of some substance

中文释义：蒸汽；水汽

Water vapour in the air condenses to form clouds.

空气中的水蒸气凝结形成云。

The hot spring emitted a cloud of vapour into the cold air.

温泉向冷空气中散发出一团蒸汽。