to break through a cocoon and transform into a butterfly

蚕蛹在漫长的等待后，终于破茧成蝶，飞向了天空。

to emerge strong and successful after undergoing a period of struggle or a difficult transformation

经过多年的磨砺，她终于破茧成蝶，从一名普通学徒成长为顶尖设计师。