During remoulding the railway and the highway, there are many difficult with small distance construction.

铁路增建第二线、公路拓宽等工程的改造施工，近距离增建隧道是困难的。

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During remoulding the railway and the highway, there are many difficult with small distance construction.

铁路增建第二线、公路拓宽等工程的改造施工，近距离增建隧道是困难的。

youdao