They conduct 150 times the electricity of similarly sized copper wires. However, because of technological difficulties, the commercial development of superconductor power-cable systems has been slow.
相比同样粗细的铜导线，他们的输电能力高达150倍，但因为技术困难，超导体输电的商业应用发展缓慢。
The electricity conduct to earth from the base of tower and copper cable.
雷电流通过塔架和铜缆经基础接地传到大地中。
The electricity conduct to earth from the base of tower and copper cable.
雷电流通过塔架和铜缆经基础接地传到大地中。
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