名词
中文翻译：信号员
同义词：
['signalman', 'operator', 'conductor']
例句：
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1. The signalman wavedhis hand to stop the traffic.
信号员挥动手示意停车。
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2. The signalman wasresponsible for monitoring the air traffic control tower.
信号员负责监控空中交通管制塔。
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3.The signalman had to be very carefulwhen operating the radio transmitter.
操作无线电发射器时，信号员必须非常小心。