以下为句子列表：
英文: Abstract: Characterized by vast coverage and extra intensity, soil erosion in the Upper Yangtze River Valley has become an important indicator of the ecological and environmental deterioration in the region.
中文: 文摘:长江上游水土流失面积广，侵蚀强度大，是其生态环境退化的重要标志。
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英文: Any of various Native American peoples inhabiting the Ottawa River valley of Quebec and Ontario.
中文: 加拿大首都，位于跨越发源于魁北克省的渥太华河的安大略湖的东南。
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英文: By 3,000 years ago the technique had spread south into Indochina and west to the Ganges River Valley in India, further increasing methane emissions.
中文: 到了3000年前，此一技术扩展到中南半岛，西至印度的恒河流域，更增加了甲烷释放量。
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英文: Characterized by vast coverage and extra intensity, soil erosion in the Upper Yangtze River Valley has become an important indicator of the ecological and environmental deterioration in the region.
中文: 长江上游水土流失面积广，侵蚀强度大，是其生态环境退化的重要标志。
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英文: Mogao Grottoes – the oldest Buddhist Holy Land of China – is located in a river valley between the Sanwei and Mingsha hills 25 kilometers away from southeastern Dunhuang.
中文: 莫高窟—中国最古老的佛教圣地，坐落在敦煌东南25公里处位于三危山和鸣沙山之间的一个河谷。
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