two-tier bridge 双层桥楼
This is the first two-tier bridge to have been designed and built by Chinese engineers in modern times.
这是第一个两层桥梁的设计和建造的中国工程师在现代社会。
But, presently the research on damage detection and diagnosis of structure focus on bridge and tier building, and the research on large space structures are few.
但是，目前结构的损伤检测与诊断研究多集中在桥梁、高层等结构上，针对大跨度空间结构损伤检测与诊断的研究很少。
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