When we think about pollution, most people imagine things like hazy air, dirty water, and litter in the ocean. Did you know there is another kind of pollution that is completely invisible? Noise pollution is common in cities around the world, and it can create serious health problems for humans and animals. The constant noise from traffic, construction, and airplanes can affect our hearing and stress levels. Sound is measured in decibels (dB). A barking dog has a loudness level of about 70 dB, and a car horn is about 90 dB.
當我們想到汙染時，大多數人會想到諸如霧霾、髒水和海洋垃圾之類的東西。你知道還有另一種完全看不見的汙染嗎？噪音汙染在世界各地的城市中都很常見，它會對人類和動物造成嚴重的健康問題。來自交通、施工和飛機的持續噪音會影響我們的聽力和壓力值。聲音的測量單位是分貝（dB）。在吠叫的狗有七十分貝左右的響度，汽車喇叭的響度約為九十分貝。
生活必備字詞：
pollution n. 汙染
litter n. 垃圾（不可數）
invisible a. 看不見的；無形的
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本文節錄自《常春藤生活英語》雜誌，完整內容請見一月號。
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