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。
Ecosystems thus involve the circulation, transformation, and accumulation of energy and matter through the medium of living things and their activities.
这个包裹着生物材料的小球的是我们身体里数十亿的细胞能够相互配合协作的媒介，通过它，我们的才能保持意识清醒，行动敏捷。
That little ball packed with biological material is the medium through which all of our billions of cells coordinate with each other to keep our conscious stable and our bodies responsive.
这样一种关系使得水分子作为一种媒介，服务于宇宙中最复杂分子的生长和演化，包括酶，蛋白质和所有活着的生物的母体，DNA。
That's allowed it to serve as the medium for the growth and evolution of the most complex molecules in the universe, including enzymes, proteins, and the mother of all known living creatures, DNA.
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