In the case of grade separation engineering for highway and railroad, underpass bridges are widely applied.

在公路、铁路等的立体交通工程中, 地道桥被广泛地应用.

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The early grade - separation structures in China are mostly subway crossings under railway tracks.

在中国,早期出现的立交工程多为下穿铁路干线的地道桥.

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