underground conduit是什么意思 underground conduit怎么读
underground conduit的用法和样例
- Recently they have laid an underground pipeline.
最近他们铺设了一条地下管道。 - Small size tunnel driving is a construction technology of underground piping without excavation.
小型隧道掘进是一种无需开挖的地下管道施工技术。
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