Other steps include adding wind and solar energy systems and planting vegetable gardens.

VOA: special.2011.07.08

This indicates that by combining two lithiums, the energy of the combined system is lower than the energies of the atomic systems.

结果显示，两个锂结合后，其结合后的能量,比原子体系的能量要低。

麻省理工公开课 - 固态化学导论课程节选

You need energy to move your arms around and move around mechanical systems, obviously, cars, boats, etcetera.

你需要能量,来移动胳膊和走动,机械系统，汽车，船等等。

麻省理工公开课 - 热力学与动力学课程节选

Others carried out energy studies of city school buildings to make sure the equipment and systems work effectively.

VOA: special.2009.09.04

It is essentially equal to internal energy for condensed systems, but when you look in the books sometimes they will use this term.

它与内能是相同的,在凝聚体系中，在你看书时有时你会发现,它们会这样使用。

麻省理工公开课 - 固态化学导论课程节选

Interest is also growing in energy management systems for the home and safe driving technologies for the car.

VOA: special.2010.01.08

So we know we always want to have our systems in as low an energy as possible, so it makes sense that a bond would happen any time we got a lower energy when we combine two atoms, versus when we keep them separate.

我们知道我们总是希望使我们的系统,处于能量尽可能低的状态，因此就应该有化学键产生,一旦我们合并两个原子之后体系的能量变得更低，相较于分开时。

麻省理工公开课 - 化学原理课程节选

So everything from creating solar hot-water systems on our rooftops to making our buildings much more energy efficient."

VOA: special.2011.07.08

Workers will also add energy efficient lights and improved building control systems.

VOA: special.2009.05.22

Eighty billion dollars of that total was to be pumped into the U.S.economy to promote development of renewable energy, urban mass transit, high-speed rail systems and clean energy jobs.

VOA: standard.2010.02.25

"Someone could attack the industrial control systems that control all the valves, all the distribution systems, and are used to turn on and off various aspects involved with energy and the electrical power grid and oil and gas distribution networks,".

VOA: standard.2009.08.11