名词短语
中文翻译：次级地层侵蚀保护
同义词：
['subsurface erosion protection', 'subsurface soil protection']
例句：
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1. To protect thesubgrade from erosion, engineers must design the drainage system carefully.
为了保护次级地层不受侵蚀，工程师必须仔细设计排水系统。
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2.The construction of this road will require extensive subgrade erosion protection measures.
这条道路的建设将需要广泛的次级地层侵蚀保护措施。
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3.The government has implemented a program to protect the subgrade from erosion caused by heavy rain.
政府已经实施了一个项目，以保护次级地层免受大雨引起的侵蚀。