根据我的记忆，水往复地变化，从湖泊和海洋里的水变成水蒸气，然后当它以雨或雪——也就是降水的形式落下时又变成水。
From what I remember, water changes back and forth from water in lakes and oceans to vapor, and then back to water again when it falls as rain or snow, as precipitation.
对水源管理者来说，只有在水通过物理蒸发变成空气的一部分，或者被植物吸收并且转变为水蒸气形式(蒸腾作用)的时候，才被消耗了。
For a water manager, the only time water is consumed is when it evaporates into the air or is soaked up by plants and then turned into water vapor (transpiration).
但是，当产生的热量渐渐超过目前的冷却能力，会有大量的水变成水蒸气的状态，使内部的压力增大。
But as long as the heat production exceeds the heat removal capacity, the pressure starts increasing as more water boils into steam.
热蒸馏涉及到加热：沸腾的水变成水蒸气- - -盐分留了下来- - -被收集的蒸汽冷却后凝结成水。
Thermal distillation involves heat: Boiling water turns it into vapor-leaving the salt behind-that is collected and condensed back into water by cooling it down.
水加温到212华氏度就变成了水蒸气。
Steam is water that’s heated to two hundred twelve degrees Fahrenheit.
在一定的条件下，水变成冰或变成蒸气。
如果受热，水会变成蒸气。
把水加热，水就会变成水蒸气。
加热到100度时，水将会变成蒸气。
如果是这样，你听到的就是水变成水蒸气并从头发里逃逸的声音。
In this case, you're hearing the water turning to steam and escaping from the hair.
太阳照射下，水变成水蒸气。
水加热后可以变成水蒸气。
水被加热时会变成蒸气。
当水蒸气变成水时，我们把它叫做冷凝。
The steam is therefore cooled, and it condenses back to water.
当水变成水蒸气时，我们把这个过程叫做蒸发。
当加热以后，水会变成水蒸气。
加热时，水变成了水蒸气。
太阳照耀，水变成了水蒸气。
暖暖的阳光照到水面上，那样水蒸发变成了水蒸气。
Next the vapour comes from the water in the river orin the sea, in the... How can the water becomes vapour?
空气升高，由于水蒸气遇冷变成水，微小的水滴就形成了。
The air rises and, since water vapour becomes water when it cools, very tiny drops of water are formed.
空气升高，由于水蒸气遇冷变成水，微小的水滴就形成了。
The air rises and, since water vapour becomes water when it cools, very tiny drops of water are formed.
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