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Programme for
Ecological Management of Arid and Semi-Arid Rangelands
干旱半干旱牧场生态管理
(联合国粮农组织和联合国环境规划署于1974年开始这一计划、帮助有关国家改良和恢复干旱半干旱地区的牧场，使饲草资源与牲畜头(只)数相适应)
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