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发行量(英语:circulation)是出版物在一段时间内发行的数量[1]。非定期出版物(如书籍)的印刷份数通常称为印数(英语:print run)。印刷品的发行量并不总是与销售量相同,后者通常称为付费发行量(英语:paid circulation)。读者人数通常高于发行量,因为一份出版物可能会被不止一人阅读。
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