What are the first day, China and Japan, and the end? What are the first day, China, Japan and the end?

1, initial stay: 2021July1July 20th, *** 10 days.

2. Mid-range: 2021July 21-August 9, ***20 days.

3. Final stage: 2021August1August 19, *** 10 day.

It appeared for the first time. According to China's calendar, it was the beginning of a real summer. People often say: heat is at three volts, and cold is at three or nine. Dog days are the season with the highest temperature and humidity in a year, which can be divided into three days: the first, middle and last days, in which the first and last days are fixed as 10 days, some years are 10 days, and some years are 20 days. At the beginning of the incubation period, it is called entering or alternating, and at the end of the incubation period, it is called appearing.