英语词汇permanent hardness怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	permanent hardness
释义	permanent hardness noun mass noun the presence in water of mineral salts (chiefly calcium sulphate) that are not removed by boiling （无机盐在水中的）永久硬度。
随便看	hectocotylus hectogram hectolitre hectometre Hector hector hectoringly Hecuba he'd heddle heder hedge hedge brown hedge fund hedge garlic hedgehog hedgehog fungus hedge-hop hedge-hopper hedge-laying hedge one's bets hedger hedgerow hedge something in hedge sparrow

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