"At a per-passenger-mile basis, rail is about three times as efficient as travel by car, in terms of fuel efficiency, and six times as efficient as travel by air, so there are pretty substantial pollution reduction benefits both in terms of greenhouse gases and other pollutants."

VOA: standard.2010.02.15

There are other vectors that are very efficient at getting DNA into cells.

但是存在某些其它载体,能易如反掌地将DNA导入细胞

耶鲁公开课 - 生物医学工程探索课程节选

And things are not as efficient as they were at the beginning of the day

而工作的进展也没有之前那么有效了。

Let's 课堂 - SpeakingMax英语口语达人

Well, one way to think about is they have more antigen binding sites and so they're going to be more efficient at neutralizing the pathogen on a per-molecule basis than IgG is.

可以这么考虑,因为IgM表面有更多的抗原结合位点,所以相对于IgG,IgM在分子层面上,能够更为有效地与病原体结合

耶鲁公开课 - 生物医学工程探索课程节选

well, that's the way Wall Street works or at least a -some people say markets are efficient and stock prices incorporate all information.

华尔街就是这么运作的,一些人认为市场是有效的,股票价格是各种信息的综合体现

耶鲁公开课 - 金融市场课程节选

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

They would pull out your entire life history of contributions-- they had it because you had filed it all at the post office and everything was bureaucratic and efficient-- and they calculated, according to a formula, what you would get.

政府会取出你这一生的交保记录-,这是由你自己在邮局填写的,所有的一切都行之有效-,然后他们根据公式计算你能得到养老金。

耶鲁公开课 - 金融市场课程节选

Tangent means that it has the same slope, it just touches the efficient portfolio frontier for risky assets at one point, and the slope of the efficient portfolio frontier, including the riskless asset, is a straight line that goes through the tangency point, here.

相切意味着斜率相同，它与包含风险资产的有效边界,交与一点，而包含无风险资产的，有效边界，则是一条过切点的直线，切点在这里。

耶鲁公开课 - 金融市场课程节选

Because that's the temperature at which many of the molecules in our bodies operate at their most efficient, and enzymes is the best example of that.

因为在正常体温下,体内许多分子活性最高,酶就是其中最好的例子

耶鲁公开课 - 生物医学工程探索课程节选