circulation

circulation
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。
    ■the continuous motion by which the blood travels through all parts of the body under the action of the heart
    血液循环
    ■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。
    ■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。
    ■[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。
常用词组
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。
    ■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。
语源
  1. late Middle English (denoting continuous distillation of a liquid): from Latin circulatio(n-), from the verb circulare (see circulate)
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