Ecosystems thus involve the circulation, transformation, and accumulation of energy and matter through the medium of living things and their activities.

因此，生态系统以生物及其活动作为媒介，涉及能量和物质的循环、转化和积累。

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A blood clot from somewhere in his body had broken free and been carried through the circulation into the heart, then lodged in his lungs.

他身体某处的血栓块脱落，通过血液循环进入他的心脏，停留在他的肺部。

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It is in fact this cooling which powers the slow circulation of the mantle, and through that the endless remaking of the surface through plate tectonics.

事实上，这种冷却过程为地幔的缓慢流动提高了动力，驱使着板块运动，实现无止境地重塑地球表面。

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But, with an average Monday-through-Friday circulation of 2, 117, 796, the Journal outpaced its nearest competitor, USA Today, by more than 200, 000 copies (1, 829, 099).

FORBES: WSJ Stays On Top in Newspaper Circulation Race

The Reserve Banks will run the newly deposited cash through highly sophisticated automated machines that count it, detect counterfeits, and destroy bank notes deemed unfit for re-circulation.

FORBES: Printing Money, Literally