永久硬水
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.
来源:词典精选例句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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