The circulating recovery ground flow can reuse circulation medium, especially for nitrogen and natural gas, the corresponding cost, risk and the extent of environment poll...

可循环回收地面流程能够将循环介质，特别是氮气和天然气重复再利用，能够大大节约成本，减少环境污染，降低风险。

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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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The newspaper is an ideal medium for most retailer s. its circulation area generally conforms to the retail trading area.

报纸是大多数零售商的理想广告媒体，其发行地域大体与零售商业务地域一致。

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