水蒸气把浴室里的镜子遮住了。
Steam has fogged the bathroom mirror.

冰、雪和蒸汽是水的不同形态。
Ice, snow and steam are different forms of water.

水受热变成水蒸汽。

水加热则成为蒸汽，冷却则成为冰。
Water is changed into steam by heat and into ice by cold.

他用蒸汽把信封上的邮票揭下来。
He steamed the stamp off the envelope.

蒸汽冷却时凝结成水。

蒸汽机车已被柴油内燃机车所取代。

这些发动机是由蒸汽驱动的。