求翻译：三年规划文件，规划内容分3年实施，核心层、骨干层、汇聚层和主配线层规划内容依据“一次规划、分步实施”的原则，根据业务发展趋势和市场业务开展情况，逐步展开建设，分批到位；辅配线层和引入层的建设依据“按需建设”的原则，根据实际接入建设需求和预覆盖的计划按需建设；骨干层管道和节点机房的建设必须遵循“先批复后建设”的原则。是什么意思？

Three-year planning documents, planning the contents of three years of implementation, the core layer, core layer, convergence layer wiring layer and the main basis for planning the content, "a plan, step by step" principle, based on business trends and market business development, and gradually sta

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Three year plan documents, the plan content is divided 3 years implementation, the core level, the backbone level, the gathering level and the host matches the line level plan content basis “a plan, is divided the step the implementation” the principle, according to the service trend of development

Three years planning file, planning content min 3 years implementation, core layer, and backbone layer, and brings together layer and main distribution line layer planning content pursuant to "once planning, and min step implementation" of principles, under business development trend and market busi

Three-year planning documents, planning the contents of three years of implementation, the core layer, core layer, convergence layer wiring layer and the main basis for planning the content, "a plan, step by step" principle, based on business trends and market business development, and gradually sta