名词
中文翻译：次级排水系统
同义词：
['subsurface drainage', "subterranean drainage例句：1. The engineer designed the subgrade drainage system to improve the road's stability.（工程师设计了次级排水系统，以改善道路的稳定性。）"]
例句：
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1. The engineer designed the subgrade drainage system to improve the road's stability.
工程师设计了次级排水系统，以改善道路的稳定性。
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2. The subgrade drainage system is crucial for preventing water seepage and maintaining the foundation of the road.
次级排水系统对于防止水渗透和保持道路基础至关重要。
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3. The construction crew carefully installed the subgrade drainage pipes to ensure proper drainage during the rainy season.
施工队仔细安装了次级排水管道，以确保雨季时排水畅通。