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optical transport network
光传送网
以波分复用技术为基础,在光上组织网络的传送网。由一组光网络元件通过光纤互连而成,在光域上实现对客户信号进行传送、路由、监控和生存性处理。
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underflow
underflow tube
under fly
underfocus
under-forest economy
under fur
underglaze blue
underglaze dark blue glaze
underglaze dark blue glazed
underglaze decoration
underglaze red
undergoing professional training at an old-type opera school
undergraduate education
undergraduate education of pratacultural science
Undergraduate Specialty Catalogue of Higher Education Institution
Underground
underground anchor rig
underground antiseepage method
Underground Architecture
underground banks
underground blasting
underground breaking vehicle
underground car loading equipment
underground cavern excavation
underground city in Northern America
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