人是“旧”的好。被古人推崇为人生四大乐事之一的“他乡遇故知”，就有着浓浓的怀旧情愫。而用以治病救人的药物则不然，“旧药”往往治不了顽症，且用药时间久了，还会产生抗药性，影响药效的发挥。因而，高明的医生不会反复使用只能治标不能治本、只能缓解病情不能除病根的? People are “old” good. Was respected by the ancients as one of the four great joys of life, “his hometown of ancient knowledge,” there is a thick nostalgia. And to treat the disease to save the drug is not the case, “old medicine” often can not cure chronic disease, and medication for a long time, but also produce resistance, affecting the efficacy of play. Thus, a brilliant doctor will not repeatedly use only a temporary solution can not cure, can only alleviate the condition can not remove the root cause?