枘凿冰炭

Explanation: Metaphor things sharply divided, and are not compatible. See "incompatible radius." 　　Source: Qing Wang Ming-sheng "Seventeen history of questionable Southern Dynasties co-written twelve Songqi Liang Chen Gu Huan two Buddha on the Road": "Huan Yu said that the approach road through quite correct, I sub Jifo, this is a man, so goes law ... ... but with Wuru, then, as incompatible diametrically of mismatched ears. "