Word · Frequency #28085
alum
明矾；铵明矾
核心释义
指化学物质明矾；表示“校友”的 alum 来自 alumnus，是另一个词。
a white crystalline double sulfate of aluminum, especially the ammonium double sulfate of aluminum
- 1.
一种收敛性盐,通常呈淡色晶体,广泛用于染色和制革业及某些药物,现已知为硫酸钾和硫酸铝的双复盐(K2SO4·Al2(SO4)3·24H2O)。
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).
- 2.
白色结晶性硫酸铝铵双盐
a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
- 3.
任何类似的硫酸双复盐,其中钾或铝部分或全部被其他一价或三价阳离子取代。
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.
- 4.
白色结晶性硫酸铝钾双盐
a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
- 5.
校友
a person who has received a degree from a school (high school or college or university)
一种收敛性盐,通常呈淡色晶体,广泛用于染色和制革业及某些药物,现已知为硫酸钾和硫酸铝的双复盐(K2SO4·Al2(SO4)3·24H2O)。；白色结晶性硫酸铝铵双盐；任何类似的硫酸双复盐,其中钾或铝部分或全部被其他一价或三价阳离子取代。；白色结晶性硫酸铝钾双盐；校友
用法In use
A tiny amount of alum can help remove fine mud from well water.
用法提示：alum 在此作不可数名词，指用来净化水的明矾。
In traditional pickling, alum is added to keep cucumbers crisp.
用法提示：alum 作名词，表示腌制用的明矾。
The jar label states that alum is used as a firming agent.
用法提示：alum 作名词，指产品成分中的明矾。
treat [something] with alum
They treated the water with alum to remove impurities.
他们用明矾处理水以去除杂质。
be an alum of [school]
此处 alum 指毕业生/校友，复数形式为 alums。
相关词与表达Connections
搭配Collocations
- potassium alum
- 钾明矾
- Potassium alum is often used in water purification.钾明矾常用于净水。
- alum powder
- 明矾粉
- Dissolve a little alum powder in water before use.使用前先将少许明矾粉溶于水。
- alum block
- 明矾块
- He ran an alum block over his skin after shaving.剃须后，他用明矾块擦过皮肤。
- alum network
- 校友网络
- She found her job through the university alum network.她通过大学校友网络找到了工作。
- fellow alum
- 同校校友
学习提示Learner notes
记忆技巧Memory Tip
alum 的 al- 像 aluminum（铝），明矾正是含铝的硫酸盐晶体，看到 alum 就想到明矾。
语境与语域Context & Register
语域：mixed 常见场景：chemistry/industry、school/alumni alum 有两个常见用法：作“明矾”时是化学/工业用语，通常出现在正式或技术语境；作“校友”讲时是 alumnus/alumna 的非正式简写，比较常见于校园或社交场合。使用时应根据语境判断。
语法说明Grammar Note
作“校友”解时可数；作“明矾”解时通常不可数。
发音与拼写Pronunciation & Spelling
No common English word rhymes exactly with /ˈæləm/. Calumny (/ˈkæləmni/) is a partial match: it contains the /æləm/ sound but adds /k/ at the start and /ni/ at the end. Watch out for lookalikes: album (/ˈælbəm/), alumni (/əˈlʌmnaɪ/), and aluminum (/əˈluːmɪnəm/) start with 'alum' or similar spelling but sound different; asylum (/əˈsaɪləm/) shares only the final unstressed /ləm/.
一起学习词形Learn the forms together
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.