While talk of what success is and how to define it went on in London, British Foreign Secretary David Miliband told NATO colleagues in Brussels that the current operations should be seen as an opportunity to bring moderate Taliban members into the political process.

VOA: standard.2009.07.27

I don't know how to define it exactly, but I feel so incredibly alive.

我不知道怎么样去定义它，但我真的感到真实的存在感。

普林斯顿公开课 - 人性课程节选

Instead, what people have done is come up with different ways to think about how they can define a radius.

而是，人们想出了其它方法,来定义半径。

麻省理工公开课 - 化学原理课程节选

To write the book, Ruth Krauss asked very small children how they would define words like "face," "dog" and "party."

VOA: special.2009.10.05

The problem it solves for the cell is how to do I make a barrier around myself to define what's in me and what's outside of me when most of what's around me and what's in me is water.

它为细胞解决的问题是,当我体外和体内大部分都是水情况下,我怎样在自己周围设置一个界线,来区分什么是体内的,什么是体外的

耶鲁公开课 - 生物医学工程探索课程节选

the saying goes. But the debate over net neutrality could define how free the exchange of information is going to be in the future.

VOA: special.2009.09.25

The person who does that best is Michael Pollan, and when you read his book, In Defense of Food, he spends some time in the book defining what food is and working through this--this quagmire of how do we define food and what's acceptable to eat, what's socially acceptable, what's personally acceptable.

这一点上迈克尔·伯伦做得最好,你们可以看看他写的书《为食物辩护》,他在书中给食物下了定义,并深入地探讨了这个难题,即如何区分食物与能吃的东西,社会普遍接受的东西,个人能够接受的东西

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选