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9月16日是国际保护臭氧层日。同学们,你们知道什么是臭氧层吗? 在距离地球表面25公里的上空有个臭氧层。它能吸收阳光中对生物有害的紫外线,是地球生态环境的保护伞。可如今的臭氧层早已“漏洞百
September 16 is the International Day for the Protection of the Ozone Layer. Students, do you know what is the ozone layer? There is an ozone layer 25 kilometers above the Earth's surface. It absorbs the harmful ultraviolet rays in the sun and is the umbrella of the earth's ecological environment. But now the ozone layer has long been a “loophole.”