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Alum
01
校友, 毕业生
a person who has received a degree from a school (high school or college or university)
02
铝钾矿
a double sulphate of aluminum and potassium that is used as an astringent (among other things)
03
明矾, 钾明矾
a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
04
明矾, 铝硫酸盐
a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
