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为促进中美农业科技交流,由六名美国农业部和有关大学的土壤学家和自然资源保护专家组成的美国土壤管理和生产力代表团,在团长拉夫·J·麦克
In order to promote the exchange of agricultural science and technology between China and the United States, the delegation of soil management and productivity from the United States composed of six soil scientists and natural resource conservation experts from the United States Department of Agriculture and related universities, led by Head Raff J Mac