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When people eating snacks, there remain some drink, such as Coca-Cola, coffee and so on. And dealing with the drink is always a trouble. If dustmen throw the bottles into trash cans, there is much remaining drink effusing. However, if they dump the drink, it will be a waste of resources. “Recycle dustbin” is designed for dealing with the remaining drink.
People can dump remaining drink into “Recycle dustbin”. And the drink will become clean water through layers of filtration. Then dustmen can use the water do some work, such as cleaning floors.