finite 有限的,有限制的:a finite number of facts

flare (火焰)闪耀,(摇曳不定地)燃烧:candle flaring in the wind

flash 闪光,闪烁:a flash of lighting

flat平坦的,扁平的:a flat land

flatter奉承,使高兴:I feel greatly flattered by your invitation

flavor味,味道,风味:drama with a European flavor

flee逃走,逃掉:The enemy troops fled in utter confusion

flexible柔韧易,弯曲的:flexible cord

fling(用力)扔,掷,抛,丢:fling sb into prison

flourish 茂盛,繁荣,兴旺:Painting flourished in Italy in the fifteenth century

fluctuate波动,起伏:You can’t march in a straight line to the victory, you fluctuate it

flush 脸红:Her cheeks flushed red

forbid 不许,禁止:Wine is absolutely forbidden to all the children

forge锻炼:forge a horse-shoe out of an iron bar

formulate规划(制度等),构想出(计划方法等)formulate a policy

fracture 裂缝,裂痕: a fracture in the pipe

frequent时常发生的,频繁的:His trips to France are less frequent now

frown 皱眉:frown at sb

frustrate 挫败,阻挠,使灰心,使无效:frustrate a plan

fulfill (fulfilled, fulfilling)履行,实现,完成: fulfill a contract

furnish供应，提供：furnish blankets for the refugees

fury狂怒，暴怒：fly into a fury

fuss大惊小怪，乱忙，小题大做：make much fuss over losing a penny