In essence, this is an an electrical transmission line.
从本质上讲，这是一个电力传输线。
The key to safe operation of electrical transmission line is the quality of suspension insulator.
输电线路可靠性运行的关键是悬式绝缘子的质量。
Electrical power line and cable workers construct, maintain and repair overhead and underground electrical power transmission and distribution systems.
电源线和电缆工人建造，维护和修复架空线和地下电力传输和配电系统。
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