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单词 gypsum
释义 gypsum
 /jip"seuhm/,  n.  
 a very common mineral, hydrated calcium sulfate, CaSO4·2H2O, occurring in crystals and in masses, soft enough to be scratched by the fingernail: used to make plaster of Paris, as an ornamental material, as a fertilizer, etc.
 [1640-50; < L: chalk < Gk gýpsos chalk, gypsum]
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