俗话说，时间就是金钱，尤其在现在社会，做事情效率是关键。

As a proverb goes, time is money. It is especially true in the modern society where effeiciency is critical.

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如果我们能弄清楚如何提高我们使用能源的效率，我们就能用可利用的能源做更多的事情。

If we could figure out how to improve the efficiency with which we use energy, we can do a lot more work with the energy that is available.

youdao

随着时间的推移，处理成本会降低，因为随着组织学会如何把事情做得更好，它们会变得更有效率。

Over time, the costs of processing go down because as organizations learn how to do things better, they become more efficient.

youdao

But the things we were trying to stress were that it's an important design decision when you are coming up with a piece of code, as to what kind of efficiency your code has.

但是我们这里要强调的是,当你写代码的时候,决定你的代码的效率的很重要的事情，就是你的设计决定。

麻省理工公开课 - 计算机科学及编程导论课程节选

Whether they're more inefficient when things are going up or when things are going down.

是不是在事情进展顺利或受阻的时候,市场会更没有效率。

耶鲁公开课 - 金融市场课程节选