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板凳

楼主 |
发表于 2011-9-9 09:50:56
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还想请问一下一个假设。 In the years since the city of Londdon imposed strict air-pollution regulations on local industry, the number of bird species seen in and around London has increased dramastically. Similar air-pollution should be imposed in other major cities. 是不是有这样一个假设。 In most major cities, air-pollution problems are caused almost entirely by local industry. |
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