This sentence expands to a noun followed by a verb followed by a sentence and there you get recursion.

这个句子就扩展成了,一个名词,后跟一个动词,再接刚才的句子,这样就变成了递归

耶鲁公开课 - 心理学导论课程节选

And the way to read this rule is you make a sentence by taking a noun, any noun, putting a verb after it, and then following that verb with a noun.

这个规则的内容是,你这样来创造一个句子,用一个名词,任何一个名词,在名词后跟一个动词,再在动词后跟上一个名词

耶鲁公开课 - 心理学导论课程节选