To thoroughly change one's original appearance or nature; to be completely transformed or remade, often implying a profound improvement or renewal.
经过多年的学习和实践，他仿佛伐毛换髓一般，从一个青涩的学徒成长为经验丰富的匠人。
After years of study and practice, he seemed to have undergone a complete transformation, growing from a naive apprentice into an experienced craftsman.
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