Thiết bị giúp người mù đi xe đạp
Đại học Bristol (Anh) đã phát triển một thiết bị mang tên Ultracane, lấy cảm hứng từ sóng siêu âm của loài dơi, giúp người khiếm thị có thể đi xe đạp dễ dàng.
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