crystal mineral
白天，能量通过加热庞大容器里的熔融盐保存起来，熔融盐由60%的硝酸钾和40%的硝酸钠组成。
During the day, energy is stored by heating up large tanks of molten salt composed of a mixture of 60 percent potassium nitrate and 40 percent sodium nitrate.
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