By "difficult," it is meant, I think, well, first of all that it is in some sense set apart from common speech, as a specialized and highly self-conscious use of language.

艰深“的意思，我认为，首先，某种程度上它是和平时谈话有所不同的，专业性极强，对语言运用自知也很高。

耶鲁公开课 - 现代诗歌课程节选

And there are many people in sort of common sense who might think "Gee, if only I could just use my rationality, think reasonably and rationally and not let my emotions guide my behavior I'd be much better off."

有许多有常识的人,也许会想,要是我能用我的理性，合理思考,不让情感指导行为,我会做得更好“

耶鲁公开课 - 心理学导论课程节选