名词
中文翻译：信号灯
同义词：
['flag', 'lighthouse', 'beacon']
例句：
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1.The semaphore was a signal for the train to stop.
信号灯是火车停止的信号。
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2. The lighthouse is used as a semaphore to guide ships in fog.
灯塔用作雾中引导船只的信号。
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3.The beacon on the mountain was used to warn of approaching storms.
山上的灯塔用来警告即将到来的风暴。