This week's violence in the north comes on top of unceasing violence in the southern Niger Delta region, where an insurgency by militants demanding a bigger share of the country's oil wealth continues to disrupt oil exports. By some estimates, Nigeria now exports only half of what it should: Angola has taken over as sub-Saharan Africa's biggest producer.
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... 经济在本世纪的领先地位：becomes the world‘s leading economy in this century 据统计:by some estimates 文化冲突culture clash ...
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By some estimates, 65% of all English words have Latin roots.
据估计，65%的英语单词包含拉丁词根。
America's economic output, by some estimates, was half of the world's total.
据估计，美国当时的经济产量占了世界产量的一半。
By some estimates, they bought twice as many aeroplanes as the market could support.
据估计，他们购买的飞机数量是市场可承受量的两倍。
By some estimates, banks have at least one trillion dollars in losses that they have not yet reported.
VOA: special.2009.01.30
As a plant scientist, he may have saved more lives than anyone else in history as many as a billion, by some estimates.
VOA: special.2009.09.22
By some estimates,non-Hispanic whites will become a minority in the United States in about thirty years.
VOA: special.2011.06.13
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