Zhang Zhongjing, famous machine, word Zhongjing, medical scientist at the end of the Eastern Han Dynasty, one of the three magic doctors in Jian 'an, was honored as "medical saint" by later generations ". From an early age, Zhang Zhongjing hated officialdom and despised official career. But he still used his own medical skills to relieve the pain of the people. In the feudal era, officials could not casually enter the homes close to the people. But if you don't contact the people, you can't treat them, and your medical skills can't improve. So Zhang Zhongjing came up with a way. He decided to open the yamen on the first and fifteenth days of each month, and let the sick people in without asking about political affairs. He sat upright in the lobby and carefully treated the masses one by one.