1. Graphics in the Winter Olympics: Axisymmetric and Centrsymmetric. The medals of the Winter Olympics are round, the five rings of the Winter Olympics are axisymmetric figures composed of five circles, and the snowflake guide cards are centrally symmetrical.

2. Ski jumping track: Parabolic frog princess Gu Ailing won the third jump. For example, the assistant speed of a skater can reach 24 meters per second. When the skater slides, we will see a beautiful parabola whose trajectory can be abstracted as a quadratic function image. Ask the athlete the maximum height from the ground.

3. National Flag: The national flags of all countries in the Winter Olympics are basically rectangular and look similar, but in fact the ratio of length to width is not exactly the same. For example, the ratio of the national flag of China is 2:3, that of the American flag is 10: 19, and that of Sweden is 5:8.

4. Number of Winter Olympics venues: Understanding of Numbers The National Speed Skating Pavilion, also known as the "Ice Ribbon", is the only newly-built ice competition venue in this competition. The National Speed Skating Hall covers an area of 17 hectare, with a 400-meter-long track and the ice surface reaches the highest standard in the world. The venue can accommodate about 12000 spectators.

5. Time of Winter Olympics: As we all know, the Winter Olympics is held every four years, and 2022 is the 24th Winter Olympics. So when is the 20th Winter Olympics?