PS: Xiaoguan people in the Northern Song Dynasty are ashamed to see your message. Respond:

The Arctic does have extreme day and night, but it also has to be seasonal. In a year, about half a year, or six months, the Arctic is a continuous day, equal to seeing the sun all the time. On the other side of the Antarctic, there are continuous extreme nights.

Simply put, if you take a stick and jump into a basketball and bake it on the fire, then no matter how you turn the stick to drive the basketball to turn, there are two small areas of basketball that cannot be baked. These...