名词
中文翻译：二级公路同义词
同义词：
['sub-grade highway', 'secondary road']
例句：
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1. The new expressway is the second-class highway that connects the city to the airport.
这条新的高速公路是连接城市和机场的二级公路。
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2. The old road was a second-class highway that served as a connecting link between the two cities.
那条旧路是一条连接两个城市的二级公路。
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3. The second-class highway is not suitable for heavy traffic and should be avoided during rush hours.
二级公路不适合重车流量，应该在高峰时段避免使用。