Devices such as hearing aids, which amplify sounds, and cochlear implants, which stimulate the auditory nerve directly, help people hear, but neither restores hearing to normal.

• 像助听器和人工耳蜗等设备都有助听效果，但都无法让人们的听力恢复到正常水平。助听器能够增加声音的强度，而人工耳蜗则会直接刺激听觉神经。