2. Chufu is the third Geng day after the summer solstice, and it is the first day of the three-volt, also known as Toufu.

3, three volts, is the collective name of the first volt, the middle volt and the last volt, and it is the hottest season of the year.

4. As the saying goes, "There are three or nine cold and three volts hot." During the dog days, on the one hand, the ancients used cool drinks to escape the heat, on the other hand, they held corresponding customs activities, such as "drinking to avoid evil". Over time, a unique food custom culture has been formed.