他们最近铺了一条地下管道。
调查人员发现地下管道已是严重腐蚀的。
The investigators found that the underground pipes were badly corroded.
研究地下管道长周期监督计划。
Studying long range plan for underground piping surveillance.
最近，他们铺设了一条地下管道。
挖掘作业可能损坏地下管道或公用设施。
Also when digging operations have potential to strike underground pipelines or utilities.
小型隧道掘进是一种无需开挖的地下管道施工技术。
Small size tunnel driving is a construction technology of underground piping without excavation.
即便是这样，地下管道的剩余空间还要容纳更多的电缆。
Little, if any, space remains in the underground conduits to accommodate more cable.
即便是这样，地下管道的剩余空间还要容纳更多的电缆。
Little, if any, space remains in the underground conduits to accommodate more cable.
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