Energy: The idea of recycling paper, glass, metal and plastics has become commonplace.

能源：回收纸张、玻璃、金属和塑料的想法越来越普遍。

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But then I found myself waiting, and soon it was seven-thirty and then eight and I imagined Robin was tired and sleeping in her metal hospital bed and would have more energy in the morning.

但那时我发现我自己还在等待着，很快就七点三十了，接着就到了八点，我猜想罗宾疲乏了，睡在医院里的金属床上，到了早晨才会有更多的精力的。

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New bus seats are higher, wider and thicker, and all metal surfaces are covered with padding-all of which absorb energy in a crash.

新的巴士座位设计成为更高、更宽、更厚的，所有金属表面将会有填充物覆盖，所有这些设计都是为了在碰撞中吸收能量。

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All right. So please raise your hand now if you think there'll be sufficient energy to eject electrons from the metal surface?

好的，如果你们认为,有足够的能量从金属表面,射出电子请举手？

麻省理工公开课 - 化学原理课程节选

So, the take-home message is whether you have three photons or 3,000,000 photons that you're shooting at your metal, if you're not at that minimum frequency or that minimum energy that you need, nothing is going to happen.

所以，这里表明的信息是,无论是向金属发射3个光子,还是300万个光子,如果没有达到所需的最低频率,或者最小能量,什么事情都不会发生。

麻省理工公开课 - 化学原理课程节选

So, we do this here for the photoelectric effect, and in terms of the photoelectric effect, what we know the important point is that the incoming photon has to be equal or greater in energy then the work function of the metal.

所以，我们做这个是为了说明，光电效应，在光电效应方面，我们知道的最重要的事情,就是入射的光子能量必须等于,或者大于金属的功函数。

麻省理工公开课 - 化学原理课程节选

Several resource deals have faltered in recent months, indicating an increasingly choosy Chinese perspective on energy and metal acquisitions.

FORBES: China Gets Picky On Commodities Deals

It turns out that China is not willing to pay whatever it has to for energy and metal resources.

FORBES: China Gets Picky On Commodities Deals

So it is funding research into getting microorganisms to extract energy from things like metal ions abundant in the earth or solar electricity.

FORBES: Far-Out Energy Technologies Win Government Cash