extemporized an acceptance speech.
即兴致贺辞
He extemporized a speech at the wedding.
他在婚礼上发表了即席讲话。
The president extemporized a speech after the working dinner.
总裁即席发表了一篇工作餐后演说。
I spoke for an hour easily, and from that time always extemporized.
我轻而易举地讲了一个钟头，从那以后我就总是即席讲话了。
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