/,sɜ:kjʊ'leɪʃn; ,sɝkjə`leʃən/ n
1 [C, U] movement of blood round the body from and back to the heart 血液循环
*have
(a) good/bad circulation 血液循环良好[不佳].
2 [U]
(a) passing of sth from one person or place to another; spread 流传; 传播
*the circulation of news, information, rumours, etc 新闻、信息、谣言的传播.
(b) state of circulating or being circulated 流通
*Police say a number of forged banknotes are in circulation. 警方称市面上有一定数量的伪钞.
* Pound notes have been withdrawn from circulation. 一英镑面值的钞票已停止流通.
* (fig 比喻) She's been ill but now she's back in circulation, ie going out and meeting people again. 她一直生病, 但现在又重新参加活动了.
3 [C] number of copies of a newspaper, magazine, etc sold to the public 报纸、杂志等售出的份数; 发行额; 销售量
*a newspaper with a (daily) circulation of more than one million （日）销售量超过一百万份的报纸
* [attrib 作定语] circulation figures 销售数字.

n
[singular, U]
the movement of blood around your body
　Exercise improves the circulation.
good/bad circulation
　Doctors had to remove her leg because of bad circulation.
[U]
the exchange of information, money etc from one person to another in a group or society
in/out of circulation
　Police believe there are thousands of illegal guns in circulation.
　The book was taken out of circulation.
remove/withdraw sth from circulation
　The Treasury Department plans to remove older coins from circulation and replace them with new ones.
[C, usually singular]
the average number of copies of a newspaper or magazine that are usually sold each day, week, month etc
circulation of
　The newspaper has a daily circulation of 55,000.
[U and C]
the movement of liquid, air etc in a system
　Let's open the windows and get some circulation in here.
in circulation/out of circulationinformal
when someone takes part or does not take part in social activities at a particular time
　Sandy's out of circulation until after her exams.