Ключевые слова: cheerful, child, childhood, children only, cleaning, concept, copy space, ecosystem, ethnicity, friendship, garbage, group of people, holiday event, learning, new, nonprofit organization, outdoor pursuit, outdoors, people, preschool, public park, recycled material, recycling, schoolboy, schoolgirl, selfless, social issues, social services, student, studying, sustainable lifestyle, thailand, variation, volunteer, waste management,