在实际中，我们定义，效率为热与功的比值。

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

youdao

换言之，鸟谷部博士靠信息做功的发动机的效率为28%。

In other words, Dr Toyabe's information-to-work engine was 28% efficient.

youdao

公司称，已开发成功C波段，功率为300W，功率转化效率为60%的放大器。

The company boasts that it produces over 300 watts (300W) of power in the C band, with 60% efficiency of power conversion.

youdao

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

So you know, what the second law is doing, in other words, it's putting these restrictions on how well or how effectively we can convert heat into work in the case of the engine, or work into heat extracted in the case of a refrigerator.

你们知道，在热机中，热力学第二定律的作用，换句话说，就是给热量,转化为功的效率,施加限制,或在制冷剂中，对抽取热量,进行限制。

麻省理工公开课 - 热力学与动力学课程节选

In that process there is a metabolic engine at work, and some people have an efficient engine so that the calories in get banked in the fat, other people have an inefficient engine, that is the calories get wasted as body heat and things like that, and they tend not to gain weight.

这过程中人体内有个工作着的代谢引擎,有些人的代谢引擎效率很高,热量便转化为脂肪储存起来,另一些人的效率低下,能量就以体温等形式被浪费了,因此他们就不容易发胖

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选