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.
例言（使用说明）：说明书的内容、体裁或使用方法的文字。参阅前言，序言。
Introduction: Description of the subject matter, style of presentation and uses of a book. See Foreword, Preface.
参阅前言，序言。
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