即席演讲；即席社交会。an impromptu speech; a spur-of-the-moment party 他因为忘了带讲稿,只好即席发言。He has to extemporize because he has forgotten to bring his note.
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Fisher’s insights have left me intrigued as I attend my niece’s fifth birthday party while Rob decides – on the spur of the moment – to head north for a spot of fishing.
当我参加小侄女的五周岁生日聚会上我对费舍尔的见解又产生了兴趣，那时罗伯决意---临时决定---向北进发去捕鱼。
On the spur of the moment, they decided to hold a fancy dress party.
他们一时兴起，决定开一个化装舞会。
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