721.optical a.光的;光学的
722.option n.选择,取舍
723.optimism n.乐观,乐观主义
724.optimum n.最适条件,最适度
725.orchard n.果园
726.orchestra n.管弦乐队的全部乐器
727.orientation n.向东;定位;方向
728.oval a.卵形的 n.卵形
729.oyster n.牡蛎;沉默寡言的人
730.pamphlet n.小册子
731.pant vi.气喘
732.panther n.豹,黑豹;美洲狮
733.pantry n.食品柜,餐具室
734.pants n.裤子;男用短衬裤
735.parachute n.降落伞
736.parade vt.夸耀
737.paralyse vt.使麻痹,使瘫痪
738.paradise n.天堂
739.parameter n.参数;参量
740.particular a.苛求的;特称的
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