臭氧层a layer of ozone high above the earth's surface that helps to protect the earth from harmful radiation from the sun
un.
1.
臭氧层
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thelayeroftheupperatmosphere, from 15 to 50 km (10 to 30 mi) abovetheEarth'ssurface, wheremostatmosphericozonecollects, absorbingharmfulultravioletradiationfromtheSun.