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

It is a system of signs, in other words, that we can make use of, that we recognize as signs precisely because they exist among us as something that can be shared in common.

它是一套符号，我们可以利用，我们可以清楚地辨明这些符号，它们无处不在,是我们大家共同分享的。

耶鲁公开课 - 文学理论导论课程节选

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