alum background

alum

/ˈæl.əm/ /əˈlʌm/

Illustration alum - Image 1

noun

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).

Examples :

"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。

compound substance chemistry material medicine industry science

Illustration alum - Image 1

noun

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.

Examples :

"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。

compound substance chemistry material science

Illustration alum - Image 1

verb

用明矾处理, 矾染。

To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.

Examples :

"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。

chemistry substance material process

Illustration alum - Image 1

noun

校友

(shortening) A past attendee or graduate (of either gender) of a college, university or other educational institution.

Examples :

""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。

person education group organization past achievement