A model for transmission lines maintenance scheduling is presented.

提出了一种输电线路检修计划模型。

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Additional development lines can be created for things like maintenance activities.

可以为诸如维护活动等事情创建附加的开发线。

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General aviation also enables helicopter rescue and ambulance services, air taxis and easier maintenance of power lines, pipelines and other infrastructure in far-flung places.

通用航空还使直升飞机救援及救护服务，空中出租车得以开通，并可以方便在边远地区进行维修输电线路，输油管路，及其他基础设施。

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But even the landlines need less human attention because Verizon is rapidly replacing old-fashioned copper lines with lower-maintenance, fiber-optic cables.

NPR: Practically Human: Can Smart Machines Do Your Job?

They also must take into account that moving electrical lines underground makes routine maintenance of the system more difficult, and thus more expensive.

WSJ: Should Utilities Be Required to Bury Power Lines to Protect Them?

Maintenance firm Tube Lines and Scheerbau, the train's owner, are also to be prosecuted by the Office of Rail Regulation.

BBC: Runaway Northern Line Tube train: Charges brought