421.flaw n.缺点,瑕疵;裂隙
422.flexible a.灵活的,可变通的
423.flask n.瓶;长颈瓶,火药筒;砂箱
424.flank n.肋,肋腹;侧面
425.flight n.溃退,逃跑;外流
426.fling vi.vt.扔,抛
427.float n.漂浮物;浮标,木筏
428.flock vi.群集,聚集
429.fluctuate vi.波动 vt.使波动
430.fluctuation n.波动;脉动;踌躇
431.flush n.兴奋,脸红;发烧
432.forge vt.打,锻造
433.formidable a.可怕的;难对付的
434.fort n.要塞,堡垒
435.fortress n.堡垒,要塞
436.forum n.论坛,讨论会
437.fossil n.化石 a.化石的,陈腐的
438.foster vt.养育,抚养;培养
439.fraction n.分数;分馏的部分
440.fracture n.破裂;裂痕 vi.破裂
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