2. The period from mid-July to mid-August is the hottest time of the year, which is divided into initial, intermediate and final stages after the summer solstice. The time of lodging in dog days is not fixed every year, and the length of lodging is also different.

3. After entering the volt, the humidity of the surface becomes larger. Every day, the ground absorbs more heat and emits less heat. The heat on the surface of the ground accumulates, so it gets hotter every day. When entering the midrange, the accumulated heat on the ground reaches the highest value, that is, the highest temperature.