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.
当我们想到污染时，大多数人会想到诸如雾霾、脏水和海洋垃圾之类的东西。你知道还有另一种完全看不见的污染吗？噪音污染在世界各地的城市中都很常见，它会对人类和动物造成严重的健康问题。来自交通、施工和飞机的持续噪音会影响我们的听力和压力值。声音的测量单位是分贝（dB）。在吠叫的狗有七十分贝左右的响度，汽车喇叭的响度约为九十分贝。
生活必备字词：
pollution n. 污染
litter n. 垃圾（不可数）
invisible a. 看不见的；无形的
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本文节录自《常春藤生活英语》杂志，完整内容请见一月号。
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