Nút bịt tai thông minh
Một công ty ở bán đảo Scandinavia đang phát triển loại nút bịt lỗ tai có thể cảnh báo người sử dụng về nguy cơ mất thính lực do tiếng ồn cực lớn.
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u7Phu4F9xrDDveG7gULhurzGoQ==