This posed a conundrum for researchers working with the laser: How were they to apply the laws of conservation of charge and conservation of energy with two forms of energy output?

这就为研究激光的工作人员出了一个难题：如果能量输出有两种形式，他们怎样运用电荷守恒和能量守恒定律呢？

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I asked one expert in charge of a clean-energy program.

我咨询了正在负责一项清洁能源项目的专家。

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The research could lead to panels that can charge a cell phone from a conversation or provide a boost of energy to the nation's electrical grid generated by the noise during rush hour traffic.

这项研究可能有助于发明出一种面板，这种面板可以使手机能够靠通话的声音来充电，或者通过上下班高峰期的交通所造成的噪音为国家电力网络提供电能。

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What people did is they said let's define a unit of energy that represents a unit charge accelerated across a unit potential difference, and let's call that the electron volt.

前人们所做的就是他们说让我们确定,一个能量单位用来代表一单位电荷,加速穿过形成的一单位电势差，我们叫它电子伏特。

麻省理工公开课 - 固态化学导论课程节选

He used various forms of high-energy radiation in order to make the droplets bear a charge.

他使用很多形式的高能辐射,为了就是使这些液滴带电。

麻省理工公开课 - 固态化学导论课程节选

So, I've got plus twos, zooming in at high energy against a wall of positive charge.

两个高能的正电荷,在正电荷壁垒时会遇到阻力。

麻省理工公开课 - 固态化学导论课程节选

The Volt also has a regenerative braking system that recovers some of the energy of braking as a charge to the batteries.

FORBES: 2013 Chevrolet Volt - Not Quite Electrifying

In the 1980s a communist, in the 1990s a democrat, Mr Kovacs is now being reborn as European Commissioner in charge of energy, as well as a backroom influence on the government.

ECONOMIST: A new prime minister steps up

All of the energy concentrated in one gallon of gasoline is enough to charge an iPhone once a day for almost 20 years.

FORBES: One Gallon of Gas Can Charge an iPhone for 20 Years