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Genetic a.遗传学的 n.遗传学 More and moere doctors believe that cancer is a genetic disease.越来越多的医生认为癌症是遗传病. Hierarchy n.等级制度;统治集团,领导层 The Supreme Court is the head of a hierarchy of federal courts.最高法院是联邦法院等级系统中的最高机构. imitation n.模仿;仿制,仿制品;赝品 An artist who can only give imitation of others styles will not achieve acclaim.一个只会模仿他人风格的艺术家是不会获得人们称赞的. Impair vt.损害,损伤,削弱 Over 200,000 babies are born in the U.S. each year with deformed bodies and impaired minds because of defective genes.每年美国出生的婴儿超过20万人由于基因有缺陷,有畸形躯体和心灵损伤. Impetus n.推动,促进,刺激;推动力 The reform and open policy is the primary impetus behind Chinas economic recovery.改革开放政策是促进中国经济恢复的主要推动力. Layman n.门外汉,外行 Doctors sometimes confuse laymen with their jargon.医生有的用专门术语把外行人弄得稀里糊涂. maneuver n.谨慎而熟练的动作,策略;演习 vt.使设法变动位置,操纵 vi.设法变动位置,用策略 | 
