6.fatal和fateful

　　fatal” causing death or disaster”“致命的”; a fatal disease不治之症;a fatal wound致命伤。

　　fateful” crucial, significant, deciding one's fate”“重大的”，“决定性的，决定命运的”; On that one fateful day in October, millions of pounds were wiped off the value of shares.

　　7.fictional和fictitious

　　fictional“虚构的，小说的”。

　　fictitious“虚构的，编造的”(denotes something that is not real and has been created with the intention of deceiving others);He gave the police a fictitious name.

　　8.historical和historic

　　historical“有关历史的”，“历史的”, the historical period历史阶段;historical personage历史人物。

　　historic“历史上有名的，有历史意义的”, historic town历史名城。

　　9.impassable和impassible impassable“不能通行的”，“不可逾越的”;an impassable swam不能通行的沼泽地。

　　impassible“不感疼痛的;无动于衷的”; an impassible God无动于衷的神。

　　10.infer和imply

　　infer“猜想，臆测”，“推断”;infer a motive from an effect从效果推知动机。

　　imply“含有……的意思”; Do you realize what his words imply?你领会他说话的含意吗? I do not imply that you are wrong.我的意思不是说你错了。