使用网络成本工程学方法对电信网络成本进行研究，可以在电信管制经济学基础研究方面有所突破。
Using the cost engineering models to study the cost of telecommunications networks could get a breakthrough in the research of telecommunications regulation economics.
在工程学看来，这是成本、维护和速度的交换。
From an engineering perspective, there are tradeoffs among cost, maintenance, and speed.
该报告警告性地指出了几乎所有地球工程学设想所存在的风险，其可行性、成本、有效性、对环境和社会的影响等方面都存在巨大的不确定性。
The report warned of the great uncertainty about the feasibility, costs, effectiveness and environmental and social consequences of almost all geoengineering ideas.
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