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| 臭氧层空洞已变小 | |
| 作者姓名： | Jacob |
| 摘 要： | On 24th September 2002, the NASA1 of America took some pictures of the ozone layer2 over Antarctica3. The pictures showed that the ozone hole found in the past had become smaller by about 40 per cent and divided into two smaller ones. |
| 本文献已被 CNKI 等数据库收录！ | |