I think it's to give us a dynamic sense of the family conversation going on between them, but it also addresses one of those obvious things.

我想这是要给我们一个有活力的家庭,对话存在于他们之间的感觉，但是它也表明了一个明显的事实。

耶鲁公开课 - 1945年后的美国小说课程节选