Chuánshuō zhōng de yīngxióng qù túlóng, zuìzhōng zhěngjiù le gōngzhǔ.
The hero in the legend went to slay the dragon and ultimately saved the princess.
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屠龙之术 (the art of slaying dragons) comes from 《庄子》: a man spent three years mastering dragon-slaying, only to find that dragons do not exist. It symbolizes mastering a skill with no practical application.