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

Well, some of the energy is going to be reflected back, and some of it is going to be transmitted into the second medium.

有些能量会被反射回来，有些则会被传送到第二种介质中。

youdao

If the two media have really different densities, like air and water, then most of the energy is going to be reflected back, very little of it will keep going and get transmitted into the new medium.

而如果这两种介质的密度相差较大，就像空气和水那样，那么大部分的能量将会折射回来，只有一小部分会继续传播进入到新的介质中。

youdao

But hydrogen still has too much potential as an energy medium to shuffle quietly off the scene.

ECONOMIST: Tech.view: Hydrogen tries again | The

Up on the committee corridor there's the first meeting of the new Energy and Climate Change sub-committee on local energy (2pm) looking at the contribution small and medium-sized projects could make to the UK's energy supply, and at barriers to medium-sized and community-owned projects.

BBC: Week ahead

The Giessens, who described their energy level as medium, found a small lab mix at the DeKalb shelter that they liked.

CNN: 'Dog Whisperer' Cesar Millan on adopting the right dog