1, Gu Ailing's 1620: Angle.

On February 8, in Shougang Park, Beijing, Gu Ailing won the first freestyle skiing women's platform gold medal in the history of the Winter Olympics with a total score of 1620 after completing the difficult third jump.

From 1080, 1440 to 1620 degrees, the difficulty is super doubled, while the rotation of 1620 degrees means that the body rotates around its upper and lower body axes for four and a half times. It is quite difficult to complete four and a half laps in the air.

2. Various graphics of the Winter Olympics venues: understanding of numbers.

The National Speed Skating Hall, also known as the "Ice Belt", 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.

The National Ski Center is also called "Snow Ruyi". The platform length of HS 140 is110m, and the drop is135m. The standard platform length of HS 106 is 106m, and the drop is 1 15m.

The national snowmobile and sleigh center is the competition venue for snowmobiles, sleds and steel snowmobiles in Beijing Winter Olympics. The stadium has 16 bends with different angles and slopes. The center covers an area of 18.69 hectares, with a building area of 52,500 square meters and a structural area of 2 1500 square meters.

3. Curling and figure skating: translation and rotation.

Curling is a translational motion in the horizontal plane. There are three kinds of rotation in figure skating, namely, upright rotation, flying geese rotation and crouching rotation.