名词
中文翻译：线路下降信号
同义词：
['line-drop signal', 'line-down signal例句：1. The line dropped the signal to indicate that the train was delayed.（线路下降了信号，表示火车晚点了。）']
例句：
-
1. The line dropped the signal to indicate that the train was delayed.
线路下降了信号，表示火车晚点了。
-
2.The engineer had to manually override the line drop signal to continue the journey.
工程师不得不手动取消线路下降信号继续旅程。
-
3.In this case, the line drop signal was triggered by a fault in the communication system.
在这种情况下，线路下降信号是由通信系统的故障触发的。