Paper back: Booksellers'term to mean soft-cover book as distinguish form hard-cover book .
普及本: 是书商用名词,意指平装本,有别于 精装本.
In other words, cover and text used in a different paper size.
也就是说, 封面需要用与内文尺寸不同的纸张.
An unbound printed work , usually with a paper cover.
通常有纸封面的小书.
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