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。

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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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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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