a few years ago 和a few years before有区别吗

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• ten years ago和in ten years ago有什么区别
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• a few years ago 和a few years before有区别吗
• 请帮忙翻译篇文章,英文~50分哦!有追加!内容和格式上一定要一对一的翻译!如果翻译的很快很好的话会有加分!出现地名/人名不会翻译的可以跳过,把英文打上就可以谢谢Thirty years ago, Lake Ponkapog in Hartwell, New Jersey, was full of life. Many birds and animals lived beside the water, which was full of fish. Now there are few birds, animals and fish. The lake water is polluted. It is in a color of dirty brown, and it is filled with strange plants. How did this happen? First, we must think about how water gets into Lake Ponkapog. When
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