Overcoming the difficulties and waiting for the flowers to bloom. Believing that we will soon return to the plain but warm days! They say the world doesn't need superheroes. If so, who will save our planet from the worsening environment? You are chosen to be the superhero of environmental protection -- Classifier. Containing pollution and epidemics, land erosion and waste of resources, the task of improving the environment and saving the earth is counting on you now! Learning while playing, waste classification can be so fun! Let's make the world a better place together, there's no doubt that you ARE the superhero who keeps watching the earth!