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人類說話的聲音差不多是 60 分貝,飛機起飛時的引擎聲,離約 100 m 處,約高達 130 dB ( A ) 。通常音量小於 50 分貝時,會讓人覺得舒適寧靜、注意力集中,並且心情愉快。 處於 70 分貝的環境下,人就會覺得心情煩躁、神經緊張、無法專心,並會影響學習,若長期處在 85 dB ( A ) 以上的噪音環境下,可能會使聽力受損,暫時性之重聽,如不好好使耳朵休息,會變成永久性之重聽。
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