Workers clean the celling in the "Ice Jar" comprehensive training center in Beijing, capital of China, on May 27, 2020. Construction of the "Ice Jar" comprehensive training center was completed on Wednesday, becoming the first newly-built venue in the Beijing competition zone for the 2022 Winter Olympic Games this year, as confirmed by Beijing Major Projects Construction Office. (Xinhua/Zhang Chenlin)

Photo taken on May 27, 2020 shows the exterior look of "Ice Jar" comprehensive training center in Beijing, capital of China. Construction of the "Ice Jar" comprehensive training center was completed on Wednesday, becoming the first newly-built venue in the Beijing competition zone for the 2022 Winter Olympic Games this year, as confirmed by Beijing Major Projects Construction Office. (Xinhua/Zhang Chenlin)

Photo taken on May 27, 2020 shows the exterior look of "Ice Jar" comprehensive training center in Beijing, capital of China. Construction of the "Ice Jar" comprehensive training center was completed on Wednesday, becoming the first newly-built venue in the Beijing competition zone for the 2022 Winter Olympic Games this year, as confirmed by Beijing Major Projects Construction Office. (Xinhua/Zhang Chenlin)

Photo taken on May 27, 2020 shows the interior look of "Ice Jar" comprehensive training center in Beijing, capital of China. Construction of the "Ice Jar" comprehensive training center was completed on Wednesday, becoming the first newly-built venue in the Beijing competition zone for the 2022 Winter Olympic Games this year, as confirmed by Beijing Major Projects Construction Office. (Xinhua/Zhang Chenlin)

Photo taken on May 27, 2020 shows the interior look of "Ice Jar" comprehensive training center in Beijing, capital of China. Construction of the "Ice Jar" comprehensive training center was completed on Wednesday, becoming the first newly-built venue in the Beijing competition zone for the 2022 Winter Olympic Games this year, as confirmed by Beijing Major Projects Construction Office. (Xinhua/Zhang Chenlin)