云不是烟或蒸汽。

The cloud is not smoke or steam.

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水变成水蒸汽时不但能够带走了火中的隐伏热量，而且还能降低烟的温度，从而阻止火灾的蔓延。

As the water turns into steam, it extracts latent heat from the fire and cools the smoke-thereby preventing the fire from jumping to a new location.

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电子烟是带电池的电子香烟，看起来就像是真的香烟一样，通过雾化等手段，将尼古丁或者其他化学物质等变成蒸汽。

E-cigarettes are battery-powered devices that look like cigarettes and deliver an aerosol of nicotine and other chemicals.

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