The investigators found that the underground pipes were badly corroded.

调查人员发现地下管道已是严重腐蚀的。

《柯林斯英汉双解大词典》

Be applied for the corrosion protection, conduction and electrostatic transfer of earthed systems and underground pipes.

用于高压输电线杆接地网及石油化工地下管线防腐、导电、防静电用。

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Valve structure that is buried, extended stem structure, making it suitable for laying of underground pipes installed in places.

球阀埋地结构即，加长阀杆结构，使其适用于管线埋地铺设安装的场所。

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He warned that at current rates of investment it would take 1, 500 years to renovate Britain's underground pipes.

BBC: NEWS | Programmes | File on 4 | Neglected sewers threaten floods

Planting native shrubs in clear-cut areas, which need to remain treeless to avoid root damage to underground pipes and to give maintenance crews access, would be better than just grass, the Nature Conservancy noted.

WSJ: Northeast drilling boom threatens forest wildlife

On loan from a Mexican museum, the work is nearly eight feet high by more than six feet wide, and depicts Depression-racked New York in four tiers: skyscrapers, a homeless shelter, underground pipes, and a bank vault.

NEWYORKER: The Painting on the Wall