The sterilization in the ice mound contains chlorine dioxide, and its functions include disinfection and sterilization.

In order to prevent and control the epidemic, many "black technologies" for epidemic prevention appeared at the Beijing Winter Olympics. Chlorine dioxide is an advanced disinfectant, which can instantly kill viruses in the air and is safe and non-toxic to human body.

In the "black technology" of epidemic prevention in this Winter Olympics, there are also mobile monitoring robots for temperature measurement and epidemic prevention, delivery robots, unmanned mobile trucks driven by intelligent car networking systems, intelligent catering robots, epidemic prevention and control clairvoyance systems, aerosol collectors and wearable temperature measuring equipment "body temperature stickers". These "black technologies" we have seen may be just the tip of the iceberg, and there are more "black technologies" for epidemic prevention in venues far beyond everyone's imagination. It is precisely because of these epidemic prevention "black technologies" that people all over the world have a direct sense of security for this Winter Olympics.