名词
中文翻译：清空信号
同义词：
['clear signal', 'clear indication']
例句：
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1.The engineer used a clear-back signal to indicate the end of the test.
工程师使用清空信号来指示测试的结束。
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2.The clear-back signal helped us to quickly locate the lost device.
清空信号帮助我们快速找到丢失的设备。
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3. During the emergency, the clear-back signal was crucial for communication.
在紧急情况下，清空信号对于通信至关重要。