The problem of statistics and estimation of disaster economic phenomena is an important prerequisite for the study of systematic engineering of natural disaster reduction and disaster economics.

灾害经济现象的统计与评估问题，是开展减灾系统工程及进行灾害经济学研究的重要前提。

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Engineering technician should consider synthetically the problem of the reliability, safety, economic of the deep foundation pit supporting, and the difficult degree of putting it into effect.

深基坑支护的可靠性、安全性、经济性和实现的难易程度是工程技术人员必须综合考虑的问题。

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It is a systems engineering to compensate them for requisition of land and help them settle down, for it is not only an economic problem, but also an important social question.

库区的征地及移民安置是一个比较系统的工程，不仅是个经济问题，而且是个重要的社会问题。

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