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facade   正面

This is a noun which means a face of a building or a superficial appearance.
For example, you can say, “Under the tough facade of a streetwise teenager, Ricky is still a 13-year-old kid who loves Disneyland.”


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facetious   爱开玩笑的，滑稽的

This is an adjective which means kidding or being playful.
For example, you can say, “Some people, like my boss, are not good at telling jokes; it’s sometimes hard to tell whether he is serious or being facetious.”


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fascinating   迷人，着迷

This is an adjective which means of great interest.
For example, you can say, “Her stories of her travels in Africa were truly fascinating.”


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fathomable   领会，推测

This is an adjective which means knowable or comprehensible.
For example, you can say, “Thirty years ago, not many people would have thought that they could buy a personal computer. Such an idea was not fathomable by ordinary people back then.”


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faux pas   失礼，失言

This is a noun of French origin which means a social slip in etiquette or manners.
For example, you can say, “She didn’t introduce herself to the host, a terrible faux pas, considering she’d never met her.”


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fervor   热诚，热心

This is a noun which means great enthusiasm.
For example, you can say, “He spoke to the crowd with incredible fervor.”


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finicky   苛求的

This is an adjective which means difficult to please.
For example, you can say, “The baby was so finicky; nothing could calm her.”


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flaunt   炫耀，卖弄

This is a verb which means to show off shamelessly.
For example, you can say, “Rather than trying to help the students learn Shakespeare, the professor was simply flaunting his knowledge of the history of British literature.”


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fortitude   不屈不挠，坚毅

This is a noun which means great mental and emotional strength.
For example, you can say, “Wendy’s fortitude really showed when her brother died.”


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fragile   易破碎，虚弱的

This is an adjective which means delicate or frail.
For example, you can say, “The glass figurines are beautiful yet very fragile.”


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fraudulent   不诚实的，欺骗的

This is an adjective which means deceitful.
For example, you can say, “There are a lot of fraudulent offerings of financial products on the Internet.”


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fraught   充满

This is an adjective which means filled with.
For example, you can say, “The crowd was fraught with fear when the gunman appeared.”


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futile   无用的，琐细的

This is an adjective which means ineffective or useless.
For example, you can say, “The attempts to change his mind were futile; he was too set in his ways.”


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