Recently they have laid an underground pipeline.
他们最近铺了一条地下管道。
Underground pipeline is the lifeline of city.
地下综合管网是城市的生命线。
Nowadays urban underground pipeline detection has been more and more important.
城市地下管线探测越来越重要。
Underground gas storehouse is important composition part of transporting pipeline system of natural gas.
地下储气库是天然气管道输送系统的重要组成部分。
Underground gas storehouse is important composition part of transporting pipeline system of natural gas.
地下储气库是天然气管道输送系统的重要组成部分。
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