道路·道路砾石道路gravel_roadin_game/common/road_types/00_generic.txt:1这条道路表面铺着一层松散的砾石。总比淤泥强。定义in_game/common/road_types/00_generic.txt:12level = 13movement_cost = -0.254market_access = -0.15pop_movement = 0.26build_time_per_unit_distance = 157price_per_unit_distance = build_gravel_road8construction_demand = build_gravel_road_demand9maintenance_demand = maintain_gravel_road_demand10color = map_gravel_road11spline_style_id = 0