名词
中文翻译：序言
同义词：
['introduction', 'preface']
例句：
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1. The book begins with an introduction to the topic.
这本书以对主题的介绍开头。
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2. The teacher gave a brief preface before starting the lesson.
老师在开始上课前简短地做了个开场白。
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3. The author's preface sets the tone for the rest of the work.
作者的序言为作品定下了基调。