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Weallknowthatrecyclingrubbishisveryimportant.Butsometim...
问题详情:Weallknowthatrecyclingrubbishisveryimportant.Butsometimesitisnotsoconvenientwhenwecan’tfindarecyclingbinanywhere.NowateamofmiddleschoolstudentsfromtheUShassolvedthatproblembydesigningtheirRec...