简约卡通扁平化教育主题黑板电脑显微镜校车等20个图

minimalist icon design, main colors light blue, orange, green, red, bright and fresh color palette, 16 icons evenly distributed, four per row, four per column, main objects include blackboard, globe, computer, microscope, apple, book, owl, school bus, student, school building, bell, book, graduation cap, map, notebook, doctor, relaxed and cheerful atmosphere, simple and clear environment, white background, clean and orderly visual effect, conveys educational emotions and information