名词
中文翻译：通过信号
同义词：
['through-signal', 'through-indicator例句：1. The radio was tuned to the emergency channel for a through signal.（收音机调到了紧急频道以便接收通过信号。）']
例句：
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1. The radio was tuned to the emergency channel for a through signal.
收音机调到了紧急频道以便接收通过信号。
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2.The police used a through signal to alert the public of an imminent threat.
警方使用一个通过信号来警告公众即将到来的威胁。
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3. The engineer used a through signal to communicate with the control room.
工程师使用一个通过信号与控制室进行通信。