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alum

/ˈæl.əm/

含义 1

a chemical compound used in water purification.

“The alum helped clarify the muddy pond water quickly.”
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alum 的插图：a chemical compound used in water purification.

含义 2

alumnus or alumna of a school

“The alum returned to give a speech at graduation.”
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alum 的插图：alumnus or alumna of a school