单词：actual mechanical advantage
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actor ['ktə] n. 男演员，角色 bore [bɔ:] v.钻孔(探)，烦扰 component [kəm'pəunənt] n.零件，成份 dictionary ['dikʃənəri] n.字典 experience [iks'piənəns] n.v.经验，体验 headache ['hedeik] n.头痛(的事) lag [lg] v.n.落伍
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