See also 400 words of composition in Nantianchao.

When school was over this afternoon, I saw that the stairs in the school were very wet, as if someone had washed them. When I walked into the house, I saw a lot of water mist on the mirror. I also saw a lot of water on the toilet wall, and a lot of water droplets on the kitchen wall and floor. I asked my mother, why is there water vapor on the mirror, wall and floor? Mom said; Because it's called going back to Nantian, and it's also called anti-tide. What is going back to Nantian? Because returning to the south sky is a phenomenon of warmer weather, it usually appears in February and March in spring, mainly because after the cold air leaves, the warm and humid airflow quickly counterattacks, resulting in an increase in temperature and air humidity. Some cold objects are easy to produce water droplets when they encounter warm and humid airflow.