The four major troubles of mankind are not only life, old age and death, but also diseases cannot be eradicated. Mankind has its own invention of medicine, and medicine and disease are as virtue rises one foot and vice rises ten. Although Xingqi, Daoyin and Zhuyou (ancient psychotherapy) will regain their attraction when the medicine is not very effective (such as inner elixir after the decline of external danshu and desperate cancer patients), they can never get rid of their vassal status.
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Medicine is the basic means of human treatment.