Once the size of the universe is doubled, both matterenergy and gravitation energy double correspondingly.
当宇宙的尺度加倍,物质和引力能都加倍——这样,零的两倍仍为零。
2
The ecologist is concerned primarily with the quantities of matter and energy that pass through a given ecosystem, and with the rates at which they do so.
生态学家主要关注的是流经某一生态系统的物质和能量的量以及它们的速度。
3
Ecosystems thus involve the circulation, transformation, and accumulation of energy and matter through the medium of living things and their activities.