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The book is an expansion of a series of lectures given last year.
本书是去年举行的系列讲座的扩充。
《牛津词典》
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The last series of questions is an expansion on the theme.
最后那一组问题是对事件实质的扩展思考。
youdao
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The last series of questions is an expansion on the theme.
最后那一组问题是对事件实质的扩展思考。
youdao