Today,Mars continues to excite -- not as the object of science fiction but of scientific study.

VOA: special.2010.07.28

You need to pin down an object of study, a first principle from which other principles can emerge, and part of the process is to say, "Hey, it's not literature we're talking about.

首要原则是，需要锁定要谈论，即学习的目标，可是，谁知道什么是文学。

耶鲁公开课 - 文学理论导论课程节选

So, for example, if you were trying to study the motion of some object, here is one example.

举个例子,如果你想研究某个物体的运动,这里有个例子

耶鲁公开课 - 基础物理课程节选

One final example of an object permanence study.

最后举一个关于客体永存性研究的例子

耶鲁公开课 - 心理学导论课程节选