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In a year, the electric buses use 72.9% less energy than the traditional ones.

一年内，电动公交车比传统公交车少消耗72.9%的能源。

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That helps people use less energy to make their homes or offices warm or cool.

这有助于人们使用更少的能源来使他们的家或办公室变暖或变冷。

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More racing companies are now producing cars that use less energy.

VOA: special.2009.11.03

The z effective is lower, so we have to put less energy in to get an ion out.

它的有效核电量更低，所以我们只需要更少的能量就能打出一个离子。

麻省理工公开课 - 化学原理课程节选

So there's less energy expanded by the system.

系统损失的能量也比较小。

麻省理工公开课 - 热力学与动力学课程节选

The fastest, cheapest way to cut emissions is by simply using less energy.

CNN: Can a 'smart grid' turn us on to energy efficiency?

SSDs using flash memory consume considerably less energy when they are operating compared to HDDs.

FORBES: Seagate Discontinuing 7,200 RPM Drives--A Focus on Capacity?

This processor allows the XO to use less energy and therefore generate much less heat.

ECONOMIST: The $100 laptop is fast becoming a reality