circulation

复数：circulations

1. [U][C]流通,循环 the flow of gas or liquid around a closed system
2. [U]流通,传播 the movement of sth, such as news or money, from place or from person to person
3. [S]发行量 the average number of copies of a newspaper, magazine, etc., that are regularly sold

• obtain a wide circulation获得广泛的销路
• improve blood circulation促进血液循环

• in circulation在流通中
• out of circulation退出社交圈子

blood circulation血液循环，血循环

in circulation在流通中；在从事社交活动的

water circulation冷水环流；水流循环

lost circulation井漏；循环液漏失

air circulation空气循环；空气环流

reverse circulation反循环；逆行循环

natural circulation自然循环

commodity circulation商品流通

general circulation环流；大气环流

atmospheric circulation大气环流；大气循环

systemic circulation体循环

circulation pump循环泵

internal circulation内循环

circulation cooling循环冷却

circulation process循环流程

extracorporeal circulation[外科学]体外循环

closed circulation闭合环流，封闭环流；闭锁循环，闭型循环

circulation rate循环率

circulation department流通阅览部；发行部

pulmonary circulation肺循环；小循环

1. The old coins have been withdrawn from circulation.
   旧硬币已经收回不再流通了。
2. The coins were taken out of circulation.
   这种硬币已停止流通。
3. Harvey discovered the circulation of the blood.
   哈唯发现了血液循环。
4. The newspaper's circulation has trebled since last year.
   去年以来该报的发行量已增加到原来的三倍。
5. This magazine has a large circulation.
   这本杂志发行量很大。
6. These ideas have been in circulation for some time.
   这些想法已经流行了一段时间。