对症之药

Explanation: Under the root cause for the drug. Analogy used to correct shortcomings and mistakes the corresponding approach. 　　Source: "Three Kingdoms Wei Zhihua Tuo Biography": "Fu Li Ni find, Li were only, both headache and fever, the pain is the same. Tacitus said: 'find the moment of, extension when sweating.' Or difficult their differences, Tacitus said: 'look outside the real, the real extension, it should be special rule.' that the respective drugs, Dan, and from tomorrow. "