Explanation: Flaw: Jade on the spot; Yu: Jade's glory. Intentionally critical spots on the jade, buried its glory. Metaphor deliberately critical shortcomings and weaknesses of others, and deny its advantages and strengths. Source: Tang Yan Ying "Refutation Lu Yin": "this too often carry details of proposed government Jingnan of ... ... yu is Jue flaws cover the theory, words are not in appropriate."