名词
中文翻译：路基
同义词：
['base', 'subgrade']
例句：
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1.The roadbed is being reconstructed to improve the traffic flow.
正在对路基进行重建以改善交通流量。
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2. The construction crew was working on the roadbed when it started raining heavily.
施工队在路基工作时，突然下起了大雨。
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3.The engineers were analyzing data from the roadbed to determine the cause of the potholes.
工程师们正在分析路基的数据，以确定坑洼的原因。