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VOALearningEnglish2013.11.20---非洲投资水稻
VOALearningEnglish2013.11.20---非洲投资水稻 Africa Invests in Rice African scientists and governments develop new methods to increase rice production. 非洲投资水稻 非洲科学家和政府制定新的方法，以提高水稻产量
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