随着一些大学学位的经济价值降至近乎为零，作为管道工或工程人员的职业培训看来还更具有吸引力。
As the financial value of some university degrees sinks towards zero, training as a plumber or an engineer will look more attractive.
采用水源调节“替代工程的影子价格”原理，计算了该地区森林生态系统的水源涵养经济价值。
The principle of "Alternating Engineering and Shade price" is applied to estimate the economic value of water conservation caused by forest ecological system.
重大工程建设项目档案是重大工程建设项目的历史记录，是工程设计、建设、管理的基础和依据，具有重大科技、经济价值。
Item files of large project construction is the historic records and basis of design, building and management. They have great importance of scientific and technological value.
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