Back copy: Out-of-date issue of magazines or periodicals.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

过期刊物：过时的杂志或定期刊物。

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She believed the payments would thrust the issue back into the public domain and raise a number of questions.

BBC: NEWS | Business | Saudi prince 'received arms cash'

At the beginning of a new volume, the issue number of a comic book may or may not roll back to No. 1.

CNN: DC Comics goes for No. 1, fans conflicted

Back then, the biggest issue was trying to figure out how to pay for increased bandwidth to run a surging number of videos.

FORBES: Timing not on Tudou's side