Xây lâu đài từ 50.000 vỏ hộp sữa
Với 50.000 vỏ hộp sữa thu thập được, các sinh viên Tây Ban Nha đã xây dựng hoàn chỉnh một toà lâu đài “độc nhất vô nhị” và được ghi tên trong sách kỉ lục Guinness.
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