Basically there are just four types of structures that can be used to bridge a stream or other obstacle: rigid beams, cantilevers, arches, and suspension systems.
基本上仅有四种结构能够用作在水流或障碍物上架桥：钢梁、悬臂结构、拱结构和悬索体系。
Because of their long span ability and light beautiful structures, suspension Bridges are competitive bridge types of long-span Bridges.
因其跨越能力大、结构轻型美观，所以是特大跨度桥梁中非常有竞争力的桥型。
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