液体保持在其熔点以上，直到需要蒸汽时才可以变回固体，释放其储存的能量。
The liquid is maintained above its melting point until steam is required at which point the liquid is allowed to turn back into a solid releasing its stored energy.
不需要蒸汽时，液体保持在熔点以上，需要蒸汽时液体才能变成固体，释放其储存的能量。
The liquid is maintained above its melting point until steam is required, at which point the liquid is allowed to turn back into a solid, releasing its stored energy.
大多数人都把水说成是一种无色液体，他们都知道，水在极冷的情况下会变成一种叫做冰的固体；而把它加热，就会变成一种叫做水蒸汽的气体。
They would know that in very cold conditions it becomes a solid called ice, and that when heated on a fire it becomes a vapour called steam.
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