What do you mean by "three stages of sting"?

First, the meaning of the three stages of fright

Sting, called Qixi in ancient times, is the third of the 24 solar terms, marking the beginning of the mid-spring season. The third stage, the first stage is: the peach begins to blossom, the peach, the fruit name, and the color is red, which is the beginning of the month. The second stage is: Cang Geng Ming, Geng is also called ostrich and oriole. What does poetry mean? Do you have Amin Cang Geng? Yeah, yeah. "Zhang Gui Jing" said: Cang, Qing also; Geng, Xinye; It is named after the fresh breath of spring sunshine. The third season is: the eagle becomes a genus of pigeons, eagles, raptors and harriers. Pigeons, today's cuckoos, are called "Turtle Classics": in mid-spring, when trees are lush and birds' mouths are still soft, they can't catch birds, so they are called pigeons.

Second, the significance of the three stages of horror