人们根据环境噪音的大小调节自己的声音。
People alter their voices in relationship to background noise.
很不幸，人类的耳朵并不能清楚地判断噪音的大小程度。
Unfortunately, the human ear does not judge clearly the degree of loudness of a noise.
很不幸，人类的耳朵并不能清楚地判断噪音的大小程度。
Unfortunately, the human ear does not judge clearly the degree of loudness of a noise.
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