名词
中文翻译：道路的基础部分同义词
同义词：
['base', 'foundation', 'subgrade']
例句：
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1. The engineers laid down the foundation for the new road.
工程师们为新路铺设了基础。
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2. The construction of the bridge was a major step in the development of the area.
桥梁的建设是该地区发展的重要一步。
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3. The road base is made of crushed stone and gravel.
道路基础由碎石和砾石制成。