noun🔗Share明矾，白矾 An astringent salt, usually occurring in the form of pale crystals, much used in the dyeing and tanning trade and in certain medicines, and now understood to be a double sulphate of potassium and aluminium (K2SO4·Al2(SO4)3·24H2O)."The potter used alum to help set the dye and make the colors brighter on the clay pots. "陶工使用明矾来帮助固定染料，并使陶罐上的颜色更加鲜艳。compoundsubstancechemistrymaterialmedicineindustryscienceChat with AIVocabulary GamePractice Reading
noun🔗Share明矾, 白矾 Any similar double sulphate in which either or both of the potassium and aluminium is wholly or partly replaced by other univalent or tervalent cations."The chemistry student identified the unknown crystal as an alum, noting its composition included sulfate and a mix of aluminum and potassium ions, characteristic of this class of double salts. "这位化学专业的学生鉴定出这种未知的晶体是一种明矾，并指出它的成分包含硫酸盐以及铝离子和钾离子的混合物，这是这类复盐的典型特征。compoundsubstancechemistrymaterialscienceChat with AIVocabulary GamePractice Reading
verb🔗Share用明矾处理, 矾染。 To steep in, or otherwise impregnate with, a solution of alum; to treat with alum."To strengthen the fabric, the seamstress alummed the delicate silk. "为了使这种娇贵的丝绸更结实，女裁缝用明矾进行了处理。chemistrysubstancematerialprocessChat with AIVocabulary GamePractice Reading
noun🔗Share校友 (shortening) A past attendee or graduate (of either gender) of a college, university or other educational institution.""My father is an alum of Harvard University, graduating in 1985." "我父亲是哈佛大学的校友，1985年毕业的。personeducationgrouporganizationpastachievementChat with AIVocabulary GamePractice Reading
