以下为句子列表：
英文: But high-voltage lines are already approaching the million-volt limit on insulators and the operating limits of semiconductor devices that control DC lines.
中文: 不过，高压线路的绝缘体已经逐渐接近百万伏特的限制，而控制直流线路的半导体装置，也即将达到运作极限。
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英文: Conductors let electricity through, but insulators don't let through.
中文: 导体让电流通过，而绝缘体则不让通过。
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英文: Hole is an charged electronic entity in semiconductors and insulators which have energies less than the Fermi level and participate in the electric conduction.
中文: 空穴是半导体和绝缘体中的一种带电体，其能量小于费米能，并且参与导电。
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英文: In the light of new type tower and corresponding insulation coordination problem of Three-Gorges power transmission project, the live line replacement of middle-phase V-string insulators including the electrical clearance of tower head, combined gap, equa
中文: 摘要针对三峡电力外送线路中出现的新型杆塔及相应的绝缘配置问题，从塔头电气间隙、等组合间隙、电位方式以及更换操作方法等方面对此类杆塔带电更换中相V串绝缘子进行了探讨。
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英文: The course of developing composite insulators and its large scale application in China are reviewed,and the statistics of domestic operating experience of composite insulators is given.The main failures which appear during the application of composite ins
中文: 回顾了我国复合绝缘子的研制以及大规模应用的历史,对于国内复合绝缘子在使用中出现的一些主要问题,如芯棒脆断、机械性能、界面击穿、沿面闪络及老化性能等方面进行了统计、分析和总结,最后展望了复合绝缘子在特高压输电线路中的应用前景。
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