As you might know, many materials expand or contract with changes in temperature, and that's true for the copper conductors used in underground transmission lines.
您可能知道， 许多材料会随着温度的变化而膨胀或收缩，对于地下传输线路中使用的铜导体来说也是如此。
Underground Transmission
原声例句
工程学速成课
英语百科
Electric power transmission
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Electric power transmission is the bulk movement of electrical energy from a generating site, such as a power plant, to an electrical substation. The interconnected lines which facilitate this movement are known as a transmission network. This is distinct from the local wiring between high-voltage substations and customers, which is typically referred to as electric power distribution. The combined transmission and distribution network is known as the "power grid" in North America, or just "the grid". In the United Kingdom, the network is known as the "National Grid".
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