ozone layer
noun
- a layer in the earth's stratosphere at an altitude of about 10 km (6. 2 miles) containing a high concentration of ozone, which absorbs most of the ultraviolet radiation reaching the earth from the sun臭氧层（位于高度10公里, 即6.2英里处的平流层内, 吸收大部分来自太阳的紫外线）。