Nuclear energy is the cleanest, most efficient energy we have - by light years.

核能是迄今为止我们拥有的最洁净、最高效的能源——以光年计算(不太明白)。

youdao

Imagine a world with levitating cars, MRIs the size of laptops, and wide scale efficient energy distribution.

想象一下这样一个世界：它有漂浮空中的车，有笔记本电脑大小的磁共振（MRI）扫描器，还有大规模配给的高效能源。

youdao

The WWS plan gives the world a new, clean, efficient energy system rather than an old, dirty, inefficient one.

此次WWS的计划为世界建立了一个新型的，清洁的，有效率的能源系统，从而取代陈旧的，污染且没有效率的能源系统。

youdao

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

VOA: special.2011.07.08

We have to invent a process, a chemical extraction process that will make the production of magnesium cheaper so that we will have the opportunity to avail ourselves of energy-efficient materials.

我们必须发明出一种方法，一种化学提炼方法,能够使生产镁变得更便宜,那样我们才有机会,让我们自己用上高效能的材料。

麻省理工公开课 - 固态化学导论课程节选

So it's a very efficient way of securing energy.

因此这是一个高效的保存能量的方法

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Bush also touched on expanded international cooperation in cleaner and more efficient energy technologies.

CNN: Bush urges more refineries, nuclear plants

Nanotech holds the promise of cleaner ecosystems, more efficient energy sources and waste-minimizing manufacturing processes.

FORBES: Nanotech Vs. The Green Gang

If these sectors can pump out low-cost, efficient energy, customers can be trusted to buy it.

FORBES: Where Federal Energy Subsidies Really Go