名词短语
中文翻译：机械操作的信号灯信号
同义词：
['mechanical signal', 'mechanically operated signal']
例句：
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1. The mechanically operated semaphore signal is used to alert drivers of an approaching vehicle.
这个机械操作的信号灯是用来警告驾驶员前方有车辆接近的。
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2.The mechanically operated semaphore signal is a crucial safety feature in highways.
这个机械操作的信号灯是高速公路上一个至关重要的安全特性。
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3.The mechanically operated semaphore signal is often used in emergency situations to guide traffic flow.
这个机械操作的信号灯在紧急情况下通常用来指导交通流。