6학년 2반

The reason why you should wear a mask.
There is a limit to the distance that bounces. Usually, it falls to the floor within one to two meters and cannot fly into the air. This is similar to the humidifier principle. The virus remains after a small drop of water from the humidifier fails to last more than 1 to 2 meters and saliva evaporates. How long the remaining virus lives is a very important factor in determining the transmission power of the virus. People with the virus bounce off and get infected. Infections continue to infect one by one and then annihilate.