名词
中文翻译：信号官
同义词：
['signalman', 'signaller', 'signalmaster']
例句：
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1. Thepoliceman was the first to spot thesuspicious car and signaled for backup.
警察是第一个发现可疑车辆并发出增援信号的人。
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2. The pilot had to signal theplane to land before it could touch down.
飞行员在飞机降落前必须发出着陆信号。
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3. The signal officer was responsible for ensuringthat all traffic lights worked properly.
信号官负责确保所有交通灯正常工作。