After understanding the rules of yin-yang, straightness and paradoxicality, branch and root, a doctor can comprehend diseases from the minor to the serious, and recognize the hazards of the hundred diseases when mentioning these rules. He can know diseases from little to many and from shallowness to deep, and learn a hundred when speaking of one. These rules can help us discern the deep from the shallow and the distant from the near. The branch and root are easy to understand, but difficult to practice.
Key Words: discussion of transmissions of branch and root diseases, in the plain questions
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