Out of the 20 channels in the channel and collateral system, only 5 enter the brain, with unclear circulation pathway in the brain.

在经络系统的20经脉中，入脑者只有5条，脑内循行路径也很模糊。

youdao

According to the US General Accounting Office, two-thirds of pennies are out of circulation, with many of them disappearing almost the moment they reach the public.

BBC: The US penny: Should it be scrapped?

When they approached the circulation desk to check it out, the librarian looked at them with a touch of respect in his eyes.

FORBES: Remembering Mom, and Her Top 6 Lessons For Life

Is this, then, a test case for publishers who could work in tandem with the fans of underappreciated and out-of-print books to bring them back into circulation?

FORBES: Kickstarter Creates New Demand For Children's Classic