To carve jade into a vessel; metaphorically, to refine oneself through training and hard work to become a person of ability and accomplishment.
他深知只有经过长期的努力和学习，才能真正琢玉成器，实现自己的价值。
He deeply understood that only through long-term effort and study could one truly refine oneself to become accomplished and realize one's own worth.
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