bridge consisting of a series of arches supported by piers used to carry a road (or railroad) over a valley
viaduct详细解释
vi.a.duct n.（名词）A series of spans or arches used to carry a road or railroad over a wide valley or over other roads or railroads.高架桥：横越一个大峡谷或其它路或铁路的高架桥、高架道路或高架铁路 来源：Latin via [road] * see via 拉丁语 via [道路] *参见 via(aque)duct(aque)duct
