What do you mean, "Martin is in the body, and the post horse is up"?

Martin is the local branch where Ding Dun is located. For example, on the 10th day of Jiazi, Ding Mao and He Miaomiao are Martin.

The body is the daily work, such as the daily test of Jiazi, and Jiazi is the body.

Martin's appearance complements Martin's daily work.

Pony: Shen Ma is in Yin, Ma Shen, Ugly Ma is in Hai, Ma is not in Hai Mao.

The introduction of the post horse is to use the post horse as the initial spread.