Today,we will tell how some insects might prove useful against hard-to-fight diseases.

VOA: special.2010.12.07

And in fact, it lies at the heart of a lot of useful computational techniques where we save results.

实际上，它也是很多保存结果的,计算技巧的核心。

麻省理工公开课 - 计算机科学及编程导论课程节选

Before long we'll see that you can actually put things inside those parentheses which make your programs even more useful.

不久之后，你们就可以看到，我们是可以在括号里面加参数的,这些参数可以让你的程序更有用。

哈佛公开课 - 计算机科学课程节选

It felt like we had useful reporting, advice, and commentary this week about almost everything and everyone truly important.

FORBES: Leadership Highlights of the Week: The Reason Why

We get useful information from the face when listening to someone, but human faces are very stimulating and all this takes processing.

FORBES: Three Methods of Persuasion You Can Copy From Obama and Romney (and one from Joe Biden that you should not copy)

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?