Skilled people understand cattle, that is, according to the physiological structure of cattle, with the least force, the most appropriate angle, with a knife to divide the whole body of cattle, handy, almost no wear on the knife.

Corresponding to health preservation, the knife is analogized to the body, the physiological structure of cattle is analogized to the running law of nature, and the running mode and trajectory of the knife are analogized to the human lifestyle. So this means:

If you live according to the running rules of nature, you will live a carefree life, and your body will hardly be damaged, and you will always be healthy!