我认识到没有必要给真正的朋友下定义。

I know that there is absolutely no need to give out definitions of a true friend.

youdao

虽然事实证明给好奇下定义很难，但大家普遍认为它是一种收集信息的手段。

While pinning down a definition has proven tricky, the general consensus is it's some means of information gathering.

youdao

“精神病”这个词很难下定义。

The term 'mental illness' is difficult to define.

《牛津词典》

STUDENT: Right, we're going to do that in a second, but the answer is Fibonacci numbers, we define the first two.

学生：听不见：,我们马上会试一试，但是答案是斐波那契数列，我们可以定义下最初的两个数。

麻省理工公开课 - 计算机科学及编程导论课程节选

But we've defined the enthalpy of those elements in their stable state at room temperature and pressure as zero, right?

但我们已经定义了这些,元素处于它们室温和常压下,最稳定的状态时的焓为零，对吧？

麻省理工公开课 - 热力学与动力学课程节选

They define four credit risk categories and they define a formula involving the amount of assets in each of the categories.

他们定义了四个风险等级,然后根据每个风险等级下的资产额,定义了一个资产总额的计算公式

耶鲁公开课 - 金融市场课程节选