Ключевые слова: art, biology, boy, buzzer, cheerful, child, childhood, children, class, coaching, conservation project, creative, creativity, diy, drawing, ecology, education, environmental, environmentalism, environmentalist, friends, girl, group, grundschule, holiday, holiday camp, international, interracial, kids, know, learn, lessons, nature, nature conservation, outline, people, plans, primary school, private lessons, pupil, school, science, scientist, summer camp, summer school, sustainability, teach, tinker, together, training, tutoring camp, vacation, vacation course, young,