There was an abnormally long circulation time;

视网膜动脉完成充盈循环时间延长；

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BACKGROUND: Amphiphilic block copolymers have been widely applied in the drug delivery system because of the high capacity of drug carriers, nanoparticles and long circulation time.

两亲性嵌段聚合物由于其较强的载药能力强、纳米级大小、血液中长循环等优点在载药系统中得到广泛的应用。

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And judging from the comments of outraged librarians, it's common for HarperCollins printed volumes to stay in circulation for a very long time indeed.

并且从那些愤怒的图书馆员的批评中可以看到，柯林斯的印刷品确实可以保持很长时间的流通。

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The mining of data on how different banknotes move through the economy would make it easy to spot suspicious transactions for example, a large deposit of notes that had been out of circulation for a long time.

ECONOMIST: Money of the future may almost literally talk

The Cablevision-owned Long Island paper has the fourth-largest paid digital circulation of any U.S. paper, according to ABC.

FORBES: More Proof That Paywalls Work From...Newsday?

One says that, over the long run, the price of gold approximates the total amount of money in circulation divided by the size of the gold stock.

NEWYORKER: Mastering the Machine