Once the size of the universe is doubled, both matter energy 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。

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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。

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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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Scientists also want to learn more about mysterious dark matter and energy, and whether the universe will expand forever.

VOA: standard.2009.05.14

All right. The other thing I have to teach you is matter-energy interaction so that we can see how the Balmer series validates the Bohr model.

好的，我要教你们的里一个知识点是,物质能量的相互作用，我们可以见证,巴尔末线系是怎样证实波尔模型的。

麻省理工公开课 - 固态化学导论课程节选

It's insulated. It's a closed system. In fact, it's an isolated system. There's no energy or matter that can go through that boundary.

系统指的，是盒子里的东西,它是封闭孤立的。

麻省理工公开课 - 热力学与动力学课程节选

In many cases, they do not have access to abundant sources of energy and have sought efficiency as a matter of energy independence--in the case of (No. 2) Denmark as an urgent national priority since the oil shocks of the 1970s.

FORBES: Magazine Article

Before 1998, most physicists believed that the universe contained far too little matter and energy.

ECONOMIST: Cosmology

But the fact of the matter is energy efficiency is a perfect example of how this can be a win-win.

WHITEHOUSE: Retrofitting for Energy Efficiency and New Jobs