In a classroom with motor muscle facilities, if air conditioning is turned on and windows are closed, a closed space is created, the indoor air will stagnate and the virus can spread easily. When the air-conditioning is on, the environment does not keep the air flowing and there may not be enough fresh air supply. Fresh air can reduce our risk of CONTRACT-19. The closed room gradually reduces fresh air to increase the risk of COVID-19 infection in children. Therefore, it is important to keep the air flowing. In addition, children can be indirectly exposed to other people's viruses by taking turns playing with cars. If children are exposed to a virus in a child with very mild or nonspecific symptoms, they will have a chance to become infected with COVID-19.
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