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He makes the splendid performance frequently extemporaneously at the concert, has made the astonishing progress.
他常常在音乐会上作精彩的即兴演奏, 取得了惊人的效果.
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"he spoke extemporaneously"
英汉双解词典包含4367426条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。