How good can human hearing be?

      人能否听到声音,不仅取决于人的听觉系统是否健全,还取决于声音的频率和强度。频率指的是物体每秒振动的次数。物体每秒振动1次,它的频率就是一赫兹,符号是Hz。一般来说,物体振动越快,频率越高,人耳感受的音调也越低。人耳可感受的声音频率范围在16~20000Hz之间,大于20000Hz的声音是超声,低于16Hz的声音是次声,这两种声音人耳都感受不到。

      在人耳能感受到的频率范围内,对频率在1000~4000Hz的声音最敏感,而人类的言语频率(人们正常的说话频率)主要在500~3000Hz之间。据测定,大多数汉语语音频率在500~3000Hz,声强在10~50dB之间的区域内。所以,如果儿童在这个区域内的听力损失较严重的话,他就难以听到或听懂他人的讲话声,也不易通过听觉途径模仿说话了。

      He is extremely sensitive to sound, and is even good at playing basketball and video games.

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