名词短语
中文翻译：现有高速公路
同义词：
['existing road', 'existing highway system', 'existing transportation network']
例句：
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1.The new expressway is expected to improve the existing highway system.
预计新的高速公路将改善现有的高速公路系统。
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2. The government has been working on expanding the existing highway network.
政府一直在努力扩大现有的高速公路网络。
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3.The construction of this new highway will connect two existing highways.
这条新高速公路的建设将连接两条现有的高速公路。