n.流通；循環(huán)；發(fā)行量；消息傳播

The old coins have been withdrawn from circulation. 舊硬幣已經(jīng)收回不再流通了。

The coins were taken out of circulation. 這種硬幣已停止流通。

Harvey discovered the circulation of the blood. 哈唯發(fā)現(xiàn)了血液循環(huán)。

This magazine has a large circulation. 這本雜志發(fā)行量很大。

These ideas have been in circulation for some time. 這些想法已經(jīng)流行了一段時(shí)間。

circulation作“流通”解時(shí),可指體內(nèi)血液循環(huán),水、空氣的流通,還可指貨幣等的流通。指報(bào)紙雜志等的“發(fā)行量”時(shí),常用單數(shù)形式。

n.再循環(huán)；回流；信息重記；信息重復(fù)循環(huán)