选择交流电作为工业标准的原因很简单，在早期供电距离很短的电网里，交流电的损耗比直流电小。

The reason was that over the short distances spanned by early power grids, AC transmission suffers lower losses than DC. It thus became the industry standard.

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由于在传输过程中采用高压直流电缆输送的损耗要比传统交流电的损耗小得多，因此采用交流电远距离传送电力很不划算。

Energy losses on DC lines are far lower than on the traditional AC ones, which make transmission of energy over long distances uneconomic.

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交流电与直流电的不同之处在于交流电不断地改变其电流流动方向。

Alternating current is different from direct current in that it constantly changes its direct of flow.

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