Not a tool you need every day, but really useful when you want it, DownThemAll is a selective, powerful download manager.

它并不是我们每天都要用到的工具，但是在我们需要的时候却能发挥很大的作用，DownThe mAll是一个精挑细选的强大的下载管理器。

youdao

The focus is really on eruptions in the last five years, but it might have some useful background material.

人们关注的焦点其实是过去五年的火山爆发，但它可能会提供一些有用的背景资料。

youdao

These are fun but are they really useful?

这些看上去很有趣但它们是不是有用呢？

youdao

It's an example of a very common tool that's going to be really useful to us, not just for doing search, but for doing a whole range of problems. That is, in essence, the template the describes a log style algorithm.

不仅仅是做搜索,还可以解决一整类问题,本质上，这个模板就描述了,对数形的算法,我们一会再回来。

麻省理工公开课 - 计算机科学及编程导论课程节选

I pride myself on the fact that people who have taken this course find it useful in their subsequent lives, but on the other hand, I think that it's really interesting.

我很骄傲的说,选了这门课的人,会在以后的生活中用到这些知识,而另一方面,我觉着这是门有趣的课

耶鲁公开课 - 金融市场课程节选

But is all that data really useful?

FORBES: Why Venture Capitalists Are Chasing This $100B Market Opportunity

But that AAA would only really be useful if it were used to back the guarantee to the EFSF.

FORBES: Eurozone: The EFSF Loses its AAA Rating

But if we really want to do something useful, we should do more than help the hard cases.

CNN: What's the value of immigration?