[原文 ]　经言上工治未病 ,中工治已病者 ,何谓也 ?然 :所谓治未病者 ,见肝之病 ,则知肝当传之与脾 ,故先实其脾气 ,无令得受肝之邪 ,故曰治未病焉。中工者 ,见肝之病 ,不晓相传 ,但一心治肝 ,故曰治已病也。(《难经·第七十七难》[注译 ]　医经上说 ,技术上等的医生能够预防尚 [Original] By the words on the work of the disease is not disease, workers in the treatment of the sick, what is also? However: the so-called treatment of the disease, see the liver disease, then the liver when the transmission of the spleen, so the first temper, no Made by the evil of the liver, so the disease is not disease Yan said. Workers in the work, see the liver disease, not know, but the heart of liver treatment, it said the disease has also been cured. (“Difficult and difficult seventy-seventh difficult” [Annotation] medical menstruation said that technically superior doctors can prevent