一本书的前言
The preface of a book
以上为机器翻译结果，长、整句建议使用 人工翻译 。
因为我现在在读了不少书之后可以告诉你，通常最能帮助我阅读一本书的，是它的前言或序言。
Because I can tell you now, after reading my fair share of books, that often the most helpful thing I have done in reading a particular book is to read the introduction or forward.
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