_ In what year did Yuan Yu write a book in Huaiyin?

For example, Five Blessingg Six Spirits. Many people think that what they can't learn is what Niu B did. This ancient time is used to calculate what the climate is like, and a certain climate will lead to more diseases. To put it bluntly, it is the ancient weather forecast and epidemiology.

Huang Yuanyu is a typical doctor who combines medicine with convenience. I don't doubt his level of treating diseases, but his theory is metaphysics. Many people mistakenly equate clinic with theory. No matter in ancient times or now, many Chinese medicine practitioners use a set of theories to explain their diseases.