与此相同，阻碍美国能源网的核心技术缺陷之一是缺乏对于超导体的认识，这种材料可以没有损失的输送电力。
Similarly, one of the key technology gaps hampering the U.S. energy grid is a lack of understanding regarding superconductors -- materials that can carry electricity with no energy loss.
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.
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