当空气温度较高时，含有较重同位素氧-18的蒸汽比含有氧-16的蒸汽更容易凝结，并形成雪状的降水。

When the air was warm, vapor containing the heavier isotope, oxygen-18, condensed and formed precipitation, in the form of snow, more readily than did vapor containing oxygen-16.

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蒸汽比其他化学消毒剂的好处是，消毒后马上就可以种植作物。

Another advantage of steam, as contrasted to chemical sterilants, is that a crop can be planted almost immediately.

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当宇航员在冰冷的星际空间漫游时，还有什么能比蒸汽更能温暖他或她的灵魂呢？

There's nothing like steam heat to warm the cockles of a spaceman's soul as he or she traverses the cold depths of interplanetary space.

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