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(220212) -- BEIJING, Feb. 12, 2022 (Xinhua) -- An athlete stands in for another during the ice hockey women's preliminary round group A match between Canada and the United States at Wukesong Sports Centre in Beijing, capital of China, Feb. 8, 2022. In ice hockey games, athletes consume energy faster due to the constant acceleration, sudden stop, and changing directions. Therefore, substitutions in ice hockey games are more frequent and faster than other sports. As the Chinese ice hockey players showed up at the Beijing 2022 Winter Olympics, this game is attracting more and more of the public's attention. At Wukesong Sports Centre in Beijing, staff working for the ice hockey events put the ice pucks into cooling boxes. The puck, made of vulcanized rubber, is a flat hard disc that needs to be frozen before the game to reduce elasticity during the play. The men's and women's ice hockey were listed as the official Winter Olympic events in the years of 1924 and 1998 respectively. Ice hockey, also known as "hockey on the ice", is like a combination of football, field hockey and short track speed skating. A contact sports as ice hockey is, it is also a combination of power and passion, bringing a powerful visual impact to the audience. At the same time, in order to ensure safety, ice hockey games have to meet certain standards for venues and players' dress code, which also constitutes some of the "cool facts" on the ice hockey rink. (Xinhua/Du Yu) 2022.02.08 Pekin Olimpiada Zimowe Igrzyska Olimpijskie Pekin 2022 - Dzien 9 Foto Du Yu/Xinhua/PressFocus !!! POLAND ONLY !!!