• 不必bú bì need not, not have to f
• 低音谱号dī yīn pǔ hào bass clef; F clef
• 电离层diàn lí céng F layer, ionosphere
• 氟fú fluorin; fluorine; Fl; F.
• 砩fú fluorine (F)
• 肯尼迪机场kěn ní dí jī chǎng JFKIAT (John F Kennedy International Airport)
• 絮凝反应xù níng fǎn yīng flocculoreaction; F. R.

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at once, at one stroke, at one time, at present, at random, at regular intervals, at school, at sea, at six, at stake,

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3G, 401(K), a,

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at the front of, at the head of, at the instance of, at the last moment, at the latest, at the least, at the mercy of, at the moment, at the most, at the opposite extreme,

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3G, 401(K), a,

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at the weekend, at the word of command, at the worst, at this time of year, at times, at variance, at war, at weekends, at will, at work,

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3G, 401(K), a,