作为所有天气系统中最强大的系统之一，飓风是由水蒸气凝结释放的热能所驱动的。
One of the most powerful of all weather systems, hurricanes are powered by the heat energy released by the condensation of water vapour.
云是由大气中的水蒸气凝结成的。
A cloud is a condensation of water vapour in the atmosphere.
大多数小学生都学过当水蒸气凝结到一定程度就形成了云。
Most elementary school students learn that clouds form when enough water vapor condenses.
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