屠龙之技

Explanation: Tu: slaughter. Killing dragon skills. Though the metaphor of technology, but no practical. 　　Usage: Partial official; as object; containing derogatory 　　Source: Zheng Lie Yukou Warring States, "Zhuang Zi Lie Yukou": "Zhu at Dragon School Assessment diffuse fragmented interests, single daughter of the house and three years into the technology, but nothing with its clever." 　　Examples: ~ Non-Japanese do not Wei. When useless, Morrow shoe pig. (Tang Liu Yuxi, "Bu Fu Ho") Thesaurus:  Dragon of the trick