像期刊和杂志一样，报纸也被叫做定期刊物。因为它们的发行也是以时间上的规律性为基础的。

Newspapers, like journals and magazines, are called "periodicals" because they are published on a regular or periodic basis.

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过期刊物：过时的杂志或定期刊物。

Back copy: Out-of-date issue of magazines or periodicals. Also called Back number.

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过期刊物：过时的杂志或定期刊物。

Back copy: Out-of-date issue of magazines or periodicals. Also called Back number.

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