名词
中文翻译：中继线
同义词：
['backbone', 'backbone network']
例句：
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1. The company's communication system relies heavily on its backbone network.
公司的通信系统严重依赖于其骨干网络。
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2. The new router is designed to replace the old backbone network.
新的路由器旨在替换旧的骨干网络。
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3. The government has implemented a plan to upgrade the country's backbone network.
政府已经实施了一个计划来升级国家的骨干网络。