The fifth part, higher agricultural education and countryside culture ecological building benignity interaction practice way.
第五部分，高等农业教育与农村文化生态建设良性互动的实践途径。
2
The essential elements within the system and the interaction of intersystem form the ecological system, economic system and social system, which produce composite results with the intervention of man.
系统内要素、系统间相互作用，构成生态系统、经济系统和社会系统，在人们的干预下产生综合效益。
3
The development and environmental pollution in sea land interaction zones cause tremendous hazards to Marine ecological environment.