The popular science posts!Nine pictures bring you the magic knowledge of the Winter Olympics

Beijing 2022 Winter Olympic Games has opened, have you prepared all the winter Olympic events in advance?Why does curling keep wiping the floor?Short track speed skating with a knife?How fast can a snowmobile go?What are the “lie down competition” and “lie down competition”?Can you tell biathlon from Nordic?Do your homework and cheer for the Chinese Winter Olympic athletes!