How to say properly translate "circulation"?
circulation fan (空气)循环风扇

money circulation 货币流通

blood curculation 血液循环

the circulation of news, information, rumours, etc 新闻/信息/谣言的传播

She's been ill but now she's back in circulation. 她一直生病, 但现在又重新参加社交活动了. 

a newspaper with a (daily) circulation of more than one million （日）销售量超过一百万份的报纸

circulation figures 销售数字.