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Children in many countries have no toys in their childhood because of poverty, which makes them not grow up as happily as children in developed countries. The design is an environmental protection refill, which can be transformed into a toy by the user after the ink is used up.After we use the ink of the refill, we usually discard it. This is not very environmentally friendly. The design not only meets the national sustainable development goal, but also enables children in poor countries to have toys.