名词
中文翻译：信号杆
同义词：
['signal post', 'signaling lever']
例句：
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1.The policeman used a signal lever to alert the driver of an approaching car.
警察使用一个信号杆来警告一辆接近的汽车。
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2. The engineer adjusted the signal lever to optimize the system's performance.
工程师调整信号杆以优化系统的性能。
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3.The construction crew moved the signal lever to the new location before starting work on the bridge.
施工队在开始建造桥梁之前将信号杆移动到新的位置。