膝痒搔背

Explanation: Itchy knee, but to scratch back. Analogy forces did not make the point. 　　Usage: Contraction type; as predicate, object; negative, suggesting an analogy did not make the point on the power 　　Source: Han Huan Kuan, "Salt and Iron profit discussion" surprisingly incompetent various health meter, far map border security strategy for the Huns, hold Withered, keep empty words, I wonder if the trend should care, when the world of change, nothing under discussion, such as Knee itch and scratch back. "