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。

youdao

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。

youdao

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。

youdao

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