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 experiments were made to investigate the possibility of improving fermentation efficiency through ameliorating medium transfer by fermentation liquid circulation.

本文通过试验，研究发酵液循环促进互花米草沼气发酵过程中介质传递，提升发酵效率的可能性。

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In addition, working medium can form natural circulation when power is failed, thus the safety and reliability of boiler operation can be improved.

并且能使锅炉工质在停电状态下产生自然循环，从而提高锅炉运行的可靠性和安全性。

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