毛毛虫在形成chrysalis之前必须脱下皮肤五次。毛毛虫不仅改变了。它完全改变。旧形式死亡，新形式是重生。那就是给我们希望的奇迹。
(caterpillar must shed its skin five times before it forms the chrysalis. The caterpillar doesn't just change. It completely transforms. The old form dies and the new is reborn. That's the miracle that gives us hope.)