名词
中文翻译：Unknown
同义词：
['trace', 'indication', 'indicator']
例句：
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1. The line signal is the first thing that catches my attention when I enter the room.
进入房间时，线路信号是首先吸引我注意的东西。
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2. The engineer used a line signal to troubleshoot the problem in the factory.
工程师使用线路信号来工厂里排查问题。
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3. The line signal was sent through the phone line to the other end of the country.
线路信号通过电话线发送到该国的另一端。