circulation
/ˌsɜːkjʊˈleɪʃən/noun
mass noun
1
- movement to and fro or around something, especially that of fluid in a closed system（尤指在封闭系统内液体）来回运行; 循环, 环流：
an extra pump for good water circulation.
为优质水循环而设的附加水泵。
1.1
- the continuous motion by which the blood travels through all parts of the body under the action of the heart血液循环。
1.2
- the movement of sap through a plant（植物内的）树液流动。
2
- the public availability or knowledge of something流传; 传播：
his music has achieved wide circulation.
他的音乐广为流传。
2.1
- the movement, exchange, or availability of money in a country（货币的）流通：
the new-look 10p coins go into circulation today.
新版10便士硬币今天投入流通。
2.2
- in sing. the number of copies sold of a newspaper or magazine（报纸、杂志的）销量：
the magazine had a large circulation.
这份杂志销量很大。
短语
in（或out of）circulation
1
- available (or unavailable) to the public; in (or not in) general use（不）在流通中; （不）在使用中：
there is a huge volume of video material in circulation.
有大量录像材料流通。
1.1
- used of a person who is seen (or not seen) in public（人）（不）在公众场合：
Anne had made a good recovery and was back in circulation.
安妮恢复得很好, 又出来活动了。
词源
late Middle English (denoting continuous distillation of a liquid)： from Latin circulatio（n-）, from the verb circulare （see CIRCULATE）.