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2.4 路基工程
路基 subgrade, road bed, formation subgrade
岩石路基 rock subgrade
软土地基路基 subgrade in soft soil zone, subgrade in soft, clay region
多年冻土路基 subgrade in permafrost soil zone
路基横断面 subgrade cross-section
路基面 subgrade surface, formation
路基面宽度 width of the subgrade surface, formation width
路肩 (road) shoulder, subgrade shoulder
路肩高程 formation level, shoulder level
路堤 embankment, fill
路堑