What's the use of automobile solar terms?

Polo is also called polonium plow. According to Cui Mang's political theory in the Eastern Han Dynasty, the plow was invented by Zhao Guo, commander of the Western Han Dynasty who was searching for millet. Its usage and effect are as follows: "Three plows * * * one cow, one race, the next race." This kind of plow is the three-legged plow still in use in the northern countryside. Rickshaws are one foot, two feet, three feet or even four feet, with two feet and three feet being more common. According to Wang Zhen's "Nongshu Leikui Gate", the specific structure of the two-legged cymbals is: "The two handles are bent upward, three feet high, the two feet are hollow, and the ridge is four turns wide. There is a bucket in the middle, and all the seeds are connected. There are also two shafts on the side, which can accommodate a cow. One person leads it, one person holds the cymbals, and the seeds are planted by themselves. "