一篇面向一般用户的 PDF 格式介绍文章，详细讲解了 PDF 的适用场景、内部结构以及常见误区，帮助用户更好地理解和使用 PDF 格式。
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https://type.cyhsu.xyz/2018/09/understanding-pdf-the-digitalized-paper/推荐理由：一篇面向一般用户的 PDF 格式介绍，覆盖了 PDF 的适用场景、内部结构、常见误区。、
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