mountain soap
名词 n.
英文释义
名词 n.
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A soft earthy mineral, of a brownish colour, which has a greasy or soapy feel and is used as a filler in crayons.
— It soils either strongly, as chalk and mountain soap; or slightly, as molybdana, lead glauce, and graphite. Besides this, there are three other distinctions connected with this character to be attended to.
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数据来源: Wiktionary