... 电源，供电方式 power and supply system 工作电源 working power source 操作电源 operating power source ...
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... 电源，供电办法 power and supply system 作业电源 working power source 操作电源 operating power source ...
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working power source
工作电源
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Crews have been working for a long time on the electric lines above the tracks, the power source for the trains.
WSJ: Probe begins after Conn. commuter trains crash
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