圣保罗夫妻用废纸板制作家具，环保又赚钱
Ana and Lucas live in São Paulo, Brazil. Every day they saw many cardboard boxes in the trash. They had a big idea. Why not turn this waste into useful things?
They started a small business called 'Caixa Forte.' The name means 'strong box' in Portuguese. They collect clean cardboard from local shops. They use a special glue to make the cardboard hard. Then they paint each piece in bright colors.
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