Karsenty's team further found that the bone resorption process creates an acidic environment that converts osteocalcin into an "active" form, which can escape bone and enter circulation.

卡尔·桑迪的研究小组进一步发现骨吸收过程创造出了一种酸性环境从而将骨钙蛋白转变为一种“积极”体，这种“积极”体能够脱离骨骼而进入血液循环。

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The most active bill in circulation is this one, which has traveled nearly 5, 000 miles to eight different states.

还在流通中的最活跃的钞票是这一位，它已经穿越过了八个州近5000英里。

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North Atlantic is the source areas of the global climate change, which is the most active area of sea circulation.

它做为全球气候变化的源头，也是海洋双层循环最为活跃的地区。

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The money is pulled out of active circulation in the economy, which has the same effect as an official decrease in the money supply.

FORBES: Beltway Keynesians

Last month, China had an estimated 220 million active smart devices in circulation versus 222 million in the United States.

FORBES: China Stripping U.S. Lead In Smart Devices Just Weeks Away

Spokeswoman Elvira Swanson notes that the company has more than 1.8 billion cards in circulation and is active in more than 200 countries around the world.

FORBES: Visa Still Weighing Its Mobile Payments Options