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2013-05-23 12:21
求翻译：In a series of population surveys that combed virtually every square yard of England, Scotland and Wales over 40 years, more than 20,000 volunteers counted each bird, butterfly and native plant they could find. An analysis of the findings appears this week in the journal Science.是什么意思？ 待解决
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In a series of population surveys that combed virtually every square yard of England, Scotland and Wales over 40 years, more than 20,000 volunteers counted each bird, butterfly and native plant they could find. An analysis of the findings appears this week in the journal Science.
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