It turns out very difficult to study this in a lab.

事实证明,很难对此进行实验室研究

耶鲁公开课 - 心理学导论课程节选

Depending on what F you fill in the blank with, what pet feature or fact you're trying to explain by appeal to the soul, you get a different argument.

根据你所挑选的不同功能特性F,以及你试图解释的现象或事实,诉诸于灵魂来进行解释,你会得到不同的论点

耶鲁公开课 - 死亡课程节选