动词短语
中文翻译：即兴演讲同义词
同义词：
['impromptu speech', 'spontaneous speech']
例句：
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1. He gave a great impromptu speech on the topic of environmental protection.
他在环境保护这个主题上做了一个精彩的即兴演讲。
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2. The speaker was so good that he could give an excellent impromptu speech on any subject.
这位演讲者非常棒，他可以在任何主题上给出一个极好的即兴演讲。
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3. During the event, there were several moments when the audience was treated to an impressive impromptu speech.
在活动中，有几个时刻，观众被精彩的即兴演讲所震撼。