We must strive for efficiency in work.

在工作中我们必须讲求效率。

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For example, vehicles reduce the commuting time and subsequently enhance efficiency in work.

比如，车提高了大家的出行效率，进而提高了工作效率。

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In the meantime, I believe that the U.S. is doing quite a bit of work in terms of raising fuel efficiency standards.

同时，我相信美国在提高燃料效率标准方面做了不少工作。

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And in practical terms, we can define the efficiency as the ratio of the heat in to the work out.

在实际中，我们定义,效率为热与功的比值。

麻省理工公开课 - 热力学与动力学课程节选

In the meantime, I believe that the U.S. is doing quite a bit of work in terms of raising fuel efficiency standards,

同时，我相信美国在提高燃料效率标准方面做了不少事，

对全球变暖的政策 - SpeakingMax英语口语达人

Since utilities are in the business of generating and distributing energy and not saving it, most of the energy efficiency work in California has been outsourced to companies that specialize in that type of work.

FORBES: Sustainability Lessons for the Big Apple

Briefly, efficiency innovations make current work more efficient, in terms of time, effort or other resources needed.

FORBES: One Kind of Innovation That Could Save American Business

That is a recommendation you might expect from a management consultancy, but no less valid for that: part of the recent increase in efficiency in Brazil's car plants, for example, comes from introducing work teams and re-designing production lines.

ECONOMIST: Measuring productivity