However, the structure adjustment and system optimization should be based on the integral understanding of the agricultural production system, and its regularity of systematic structural evolution.
农业结构的调整，必须建立在对系统整体认识的基础上，必须符合系统结构本身的演变规律。
Vigorously promote the adjustment and optimization of import structure of mechanical and electronic products.
一是大力推动机电产品进口结构的调整和优化。
The optimization of urban industry structure can cause the mass effect of economic, and the adjustment of urban industry structure can lead to the changing of the way and the structure of land use.
城市产业结构的优化会产生经济聚集效应，而城市产业结构的调整会引起用地方式和土地利用结构的转变。
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