The optimum system architectures is the four-level computer network that centralizes the process of real-time tracing information in the computer centers at the railway bureau.
最佳的系统结构是以铁路局计算中心为实时追踪处理点的四级计算机网络。
Six railroads link up with the whole nation network of railways and adjacent Vietnam, a high level railway centre was began to form in Kunming.
六条铁路与全国铁路网和相邻的越南相连，以昆明为中心的高等级公路网正在形成。
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