... emergency pulse ==> 呼救脉冲 emergency pulses ==> 呼救信号 emergency pump ==> 危急排水泵,应急泵,备用泵,事故应急泵 ...
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The signal preemption idea was born in the early 1970s, when 3M devised a system that let emergency vehicles change traffic signals with pulses of strobe lights (later, infrared light) transmitted to receivers mounted over roadways.
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