Bàn chải đánh răng công nghệ 3D
Cập nhật: 15:27 01/10/2013 GMT+7
Sử dụng công nghệ ba chiều, các kỹ sư ở Tây Ban Nha đã phát triển một loại bàn chải làm sạch răng cho khuôn miệng của từng người.
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