Khả năng học tiếng suy giảm sau tuổi lên 2
Năng lực cảm thụ ngôn ngữ của chúng ta giảm dần khi bước sang tuổi thứ 3 - một giai đoạn quá sớm trong cuộc đời. Phát hiện này đã đưa đến khuyến cáo rằng nên cấy ốc tai cho trẻ bị điếc càng sớm càng tốt.
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