circulation
英 [s??kj?'le??(?)n]
美[,s?kj?'le??n]
- n. 流通，傳播；循環(huán)；發(fā)行量
詞組搭配
in (或out of) circulation
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.
有大量錄像材料流通。