Secondly, the system of transforming agricultural science and technology and extension services is brewing a breakthrough.
二是农业科技转化与推广服务体系正酝酿着体制突破；
The returns of land exist in the open system of agricultural production which is closely related to the progress of science and technology achieved in a society.
土地报酬存在于受社会科学技术进步影响的农业生产这个开放系统中。
Chapter four is technological innovation system construction of agricultural science and technology enterprises.
第四章：农业科技企业技术创新体系的构建。
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