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The testing of railway signaling relays is very important to railway security.
铁路信号继电器的检测是保障铁路安全运行的重要环节.
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The main function of the railway signaling system is to ensure safe operation of train.
铁路信号的主要功能是保证行车安全.
铁道信号???又称 :铁道信号(railroad signaling)???
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