Xe đạp tự tạo ra làn đường
Cập nhật: 13:56 29/10/2012 GMT+7
Nhờ hệ thống đèn đặc biệt, một loại xe đạp mới tại Mỹ có thể tự tạo ra làn đường của nó trong lúc di chuyển vào ban đêm.
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