available (or unavailable) to the public; in (or not in) general use
(不)在流通中;(不)在使用中
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there is a huge volume of video material in circulation .有大量录像材料流通。
used of a person who is seen in public
(人)在公众场合
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Anne had made a good recovery and was back in circulation .安妮恢复得很好,又出来活动了。