水一旦被加热，就通过保温材料保温。这使得水可以长时间保持一定温度。
Once the water is heated, it is kept hot with insulation material. This allows the water to stay warm for a long time.
水一旦被加热，就通过保温材料保温。这使得水可以长时间保持一定温度。
Once the water is heated it is kept hot with insulation material. This allows the water to stay warm for a long time.
有些太阳能项目利用大桶大桶融化的盐，这些盐一旦被太阳能加热，就会保持这个温度不变。
Some solar projects include vats of molten salt, which, once warmed by solar energy, retains heat.
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