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flutter/ˈflʌtə/ I.vi.1.飘动，飘扬：The red flags are fluttering in the wind.红旗随风飘扬。2.拍翅，拍翅而飞：The butterfly fluttered from flower to flower.蝴蝶拍打着翅膀在花丛中飞···

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flux/flʌks/n. [c] & [u] 1.连续的改变，不稳定的状态：The whole political system is in a state of flux.整个政治体制飘忽不定。2.流，涌流；流出，溢出：the flux of men and women mo···

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fly/flai/ I.vi.&vt.(flew /flu:/, flown /fləun/) 1.飞，飞行: When winter comes, some birds will fly away to the south.冬天到来时，一些鸟就会飞到南方去。2.乘飞机旅行: We flew fr···

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foam/fəum/ I.n.［u］泡沫，泡沫材料：foam rubber泡沫橡胶，海绵橡胶；form foam起泡沫；the foam of the mouth涎沫‖II.vi.起泡沫：foaming beer起泡沫的啤酒The stream foams over the rock···

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focus/ˈfəukəs/ I.n.［c］1.焦点，焦距：The focus of a near-sighted eye is nearer the face than the focus of normal eyes.近视眼的焦点比正常眼焦点离面部近。adjust the focus调焦距2.···

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foe/fəu/n.［c］反对者，敌人，危害物：to join forces against a common foe联合起来对付共同的敌人They steadily pushed their foes before them.他们不停地追击敌人。

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fog/fɔɡ/ I.n.［c］&［u］1.雾：London has bad fogs in winter.伦敦冬天有大雾。2.烟雾，尘雾：a dust fog一片尘雾3.迷惑，困惑：be lost in a fog困惑不解‖II.vt.(fogged, fogging)以雾···

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foil/fɔil/ I.n.1.［u］箔，金属薄片: tin foil锡箔；aluminium foil铝箔2.［c］陪衬物，陪衬者: serve as a foil作陪衬‖II.vt.挫败，使受挫折：foil sb.’s scheme使某人的阴谋不能得逞；be ···

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fold/fəuld/ I.vt.&vi.1.折叠: to fold a paper in half把报纸对折Fold your napkin.把你的餐巾折起来。He folded up the letter and put it in his pocket.他把信叠好然后放进口袋。2.能折···

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foliage/ˈfɔliidʒ/n.［c］树叶，植物（总称）：evergreen/year-round foliage常青树叶Most trees lose their foliage in winter.大多数树木在冬天落叶。