You could look at what it does but babies are not very coordinated or skilled so you need to use clever methods.

你可以观察婴儿,但婴儿不怎么配合,或者说他们的言语技能并不熟练,所以你必须要用精巧的方法才能做到

耶鲁公开课 - 心理学导论课程节选

Similarly, in naval battles Themistocles at Salamis comes up with a clever device.

在萨拉弥斯海战中,地米斯托克利也是靠着类似的招数才扭转乾坤

耶鲁公开课 - 古希腊历史简介课程节选

Now, what they did was--they were clever psychologists so they set it up in a study where the people did not know sexual orientation was at issue.

他们都是聪明的心理学家,他们设计了一个实验,实验对象并不知道研究的是同性恋问题。

耶鲁公开课 - 心理学导论课程节选

One clever method is to look at their brain waves.

一种聪明的方法便是去观察脑电波

耶鲁公开课 - 心理学导论课程节选