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flourish/ˈflʌriʃ/vt.&vi.1.繁荣，兴旺，处于盛世: His business is flourishing.他生意兴隆。2.健康成长；干得好：Crops flourish in rich soil.肥沃土壤里庄稼长得旺。

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flow/fləu/ I.vi.1.流动：Rivers flow into the sea.江河归大海。Time flows away.光阴流逝。2.(头发，衣服)飘垂：Her hair flowed down her shoulders.她长长的头发飘垂到肩上。‖II.n.(只有s···

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flower/ˈflauə/ I.n.［c］花，花卉：a flower show花展；to grow/plant flowers种花The flowers are out.花开了。‖II.vi.开花：Cherry trees flower in the early spring.樱桃树早春开花。

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flu/flu:/n.(=influenza)流行性感冒：bird flu禽流感Flu is more serious than a bad cold.流行性感冒比重感冒还厉害。

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fluctuate/ˈflʌktjueit/vi.波动，涨落，起伏：fluctuate in the exchange rate汇率波动［考句］With prices fluctuating so much, it is difficult for the school to plan a budget.由于价格···

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fluent/ˈflu:ənt/adj.流利的，流畅的：He was here because of his fluent Spanish.他之所以能在这儿，是因为他能说一口流利的西班牙语。［考句］Though he was born and brought up in Ameri···

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fluid/ˈflu(:)id/ I.adj.流体的，流动的：fluid opinions (plans)不固定的意见(计划) ‖II.n.［u］&［c］流体；液体：cooling fluid冷却液；tear fluid泪液；black writing fluid墨汁Fluid···

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fluorescent/fluəˈresnt/adj.荧光的，莹光的：fluorescent lamp/light/tube荧光灯，日光灯；fluorescent screen荧光屏This shop sells fluorescent paint.这家商店出售荧光漆。

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flushI/flʌʃ/ I.vt.&vi.1. (脸)发红，脸红:［考句］His face flushed as he came in after running all the way from school.从学校一路奔跑回来，他脸色发红。2.（被）冲洗: flush the d···

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flute/ˈflu:t/n.［c］长笛，笛状物：Andrew's flute was made of wood.安德鲁的笛子是木头制的。The openIng In the mouthpiece of afluteacross which the player blows.笛子长笛上吹奏者···