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http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Agriculture sustainable development has many limit factors in Shaanxi, These factors may divide into three kinds of factor according to its intensity and difficulty, including long, medium, short time interval.
http://www.w3.org/ns/prov#wasQuotedFrom	economics-papers.com