You've got vehicles, but you also have things like the tracks and the overhead wires and the tunnels themselves that need to be checked up on a regular basis.
- 你有车辆，但你也有轨道、架空电线和隧道本身需要定期检查的东西。
Overhead wires
原声例句
问答进行中
美丽与毁灭（下）
Pointlessly, ridiculously, they rose and walked about the table; seen thus, all that they did appeared incongruous—it was as though they were being jiggled carelessly and to no purpose by invisible overhead wires.
他们毫无意义地、可笑地站起来绕着桌子走来走去；这样看来，它们所做的一切都显得不协调——就好像它们被无形的架空电线漫不经心地摇晃着，毫无意义。
中文百科
高架电缆 Overhead line
（重定向自Overhead wires）
架空接触网（又称架空电缆），是凭借电杆支撑，架设于电力驱动交通工具行驶轨迹上方半空，在与其接触连接时用以向其直接供电的特殊形式的输电线路。在电气化铁路和城市轨道交通系统中，架空接触网一般只有1根接触导线（简称触线），电力机车或动车通过受电弓取电，再通过金属轮轨回流到电网中；而在无轨电车等使用胶轮的系统中，架空接触网有一正一负2根互相平行的触线，通过2根受电杆取电并形成通路。
英语百科
Overhead line 高架电缆
（重定向自Overhead wires）
An overhead line or overhead wire is used to transmit electrical energy to trams, trolleybusses, or trains. It is known variously as:
In this article, the generic term overhead line is used, as used by the International Union of Railways.
Overhead line is designed on the principle of one or more overhead wires (or rails, particularly in tunnels) situated over rail tracks, raised to a high electrical potential by connection to feeder stations at regular intervals. The feeder stations are usually fed from a high-voltage electrical grid.
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