"The law is based on Yin and Yang, and on the number of skills", which is the general principle of health preservation in Huangdi Neijing, and its essential meaning is to live according to the laws of nature.

The meaning of "and several tricks" is to comply with several tricks. The skill number is the method and technology. The most important word of "number sum" is "sum". If a person wants to live a long and healthy life, the most important thing is "harmony", harmony with nature, harmony with society, harmony with others, harmony with his own body and mind, and harmony with his own body and mind.