名词
中文翻译：州级公路系统
同义词：
['national highway system', 'federal highway system']
例句：
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1. The state highway system is essential for connecting rural areas to urban centers.
州级公路系统对于连接农村地区和城市中心至关重要。
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2. The state highway system has been improved significantly since the last update.
自上次更新以来，州级公路系统有了显著的改进。
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3. The state highway system is a vital link in the transportation network.
州级公路系统是交通网络中不可或缺的一环。