Can you make a novel, as he says in the essay, that will "sprout wings and grow claws" in secret in his mind? That's an image taken from the metamorphosis of the butterfly within the chrysalis.

你能够让一本小说，就像他在那篇文章里说的那样，会在他,脑海里秘密的“展开翅膀，伸出爪子“？，这是从蝴蝶羽化中,借鉴来的比喻。

耶鲁公开课 - 1945年后的美国小说课程节选