名词
中文翻译：即兴的
同义词：
['spontaneous', 'spontaneously']
例句：
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1. The musician played an impromptu piece on the spot.
这位音乐家现场即兴演奏了一段音乐。
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2. She decided to go to the beach without any plans in mind.
她决定没有计划就去了海滩。
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3. He was so excited that he couldn't help but perform an impromptu dance.
他太兴奋了，忍不住即兴跳起了舞。