| 单词 | ozone shield |
| 释义 | > as lemmasozone shield ozone shield n. = ozone layer n. ΘΚΠ the world > the earth > weather and the atmosphere > [noun] > specific regions of upper air1586 upper atmosphere1586 stratosphere1909 troposphere1909 ionosphere1926 ozone layer1927 ozonosphere1933 spray region1949 mesosphere1950 thermosphere1950 turbosphere1951 magnetosphere1959 Van Allen1959 ozone shield1965 plasmasphere1966 ozone1975 1965 Proc. National Acad. Sci. U.S.A. 53 1206 Plants freed oxygen, which accumulated in the atmosphere; and this, in turn, provided the ozone shield which today screens the earth's surface. 1992 N.Y. Times 5 May c1/1 Waste industrial chemicals were weakening the stratospheric ozone shield that protects living things from biologically harmful ultraviolet rays. < as lemmas |
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