然而要在电网中用超导体完全取代铜导线，目前仍然有一些技术障碍，最关键的问题是费用。
However, there are still some technological hurdles to overcome before superconductors replace the copper wires in our power grids. The main issue is cost.
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。
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.
不同于低温超导体，在高温超导线圈中，一定体积内的热积累是造成失超的较主要原因。
Unlike the low temperature superconductors, heat accumulation in a specific volume is more likely the main cause of quenches for the high temperature superconductive (HTS) coils.
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