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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Red blood cells and specialist immune cells are seen in the sinusoids, pink structures running through the tissue for circulation.

红血细胞和特殊免疫细胞(粉红色部分)在肝窦隙中周而复始地循环。

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Visitors were nosing through racks of dog-eared best sellers, schmoozing near the circulation desk and peering into Banks of computers on long tables in the lobby.

图书馆的访客们正在小心地穿过堆满缺角的畅销书的书架，在流通服务台前面闲谈，顺便瞥一眼大厅里面长桌上成行的计算机。

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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