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单词 presbyopia
释义 presbyopia
 —presbyopic /prez'bee op"ik, pres'-/,  adj.  
 /prez'bee oh"pee euh, pres'-/, n. Ophthalm.
 farsightedness due to ciliary muscle weakness and loss of elasticity in the crystalline lens.
 [1785-95; < Gk presby- (comb. form of présbys old, old man) + -OPIA]
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