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你听说过女娲炼五色石补天的故事吗?那是很古的事情。现在也要补天了,补南极洲上空臭氧层的大窟窿。什么是臭氧层?臭氧层就是高度在10至50千米之间的大
Have you ever heard of the story of Nuwa refining colored stones? It is a very old thing. Now I have to fill the sky, making up the big hole in the ozone layer over Antarctica. What is the ozone layer? The ozone layer is between 10 and 50 km in height