What is the meaning of "three pushes of ice and thunder" and the origin of allusions?

In the section of "Seventy-one Records, Three Music, and the Joy of Sacrificing a Temple Group in a Suburb" in the Draft of the History of Qing Dynasty, there are "catching thunder, pushing three things and doing things in the east." Five winds and ten rains, the soil rate is private. There is a sentence in Ganquan Fu (Preface to Parallel Prose) collected in the seventh volume of Selected Works, which is "Sacrificing to the suburbs to plow and hunting on the farm", and the annotation is "Knowing that my emperor is a spiritual altar and caring for the royal couple". Ying Shao Han official said: On the day when the son of heaven plowed eastward, the son of heaven rose to the altar, and there was no sacrifice on it. The son of heaven plowed the altar and only pushed it three times.

In fact, it is good to push it three times, or push it three times, that is, the emperor held a sacrifice to the suburbs and picked up the farm tools symbolically twice. There is only one meaning, and the emphasis is on meaning rather than workload. It is the same reason that the current leaders laid the foundation for planting trees, and they are all educating the people to work hard.