... permanent hard water 永久硬水; 永硬水 permanent hard-water 永久硬水 soften hard water 使硬水软化 ...
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permanent hard water 永久硬水 ; 永硬水
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Hard water which can be softened by adding sodium carbonate is called permanent hard water.
经过加入碳酸钠能被软化的硬水，称为永硬水。
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