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。
Test results show that composite foundation scheme of the post grouting CFG pile satisfies requirements of design, which proves that this scheme has good economic benefit.
检测结果表明，该后压浆CFG桩复合地基满足设计要求，具有良好的经济效益。
This application practice showed that steel concrete composite beams are very suitable for long span structures and have good technical and economic results.
工程实践表明，钢-混凝土组合梁用于大跨结构，具有显著的技术经济效益和社会效益。
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