signal-tracing instrument

例句：

1. 1. Theengineer used a signal-tracing instrumentto locate the fault in the pipeline.
   工程师使用信号追踪仪器定位管道中的故障。
2. 2.The scientist developed a new signal-tracing instrument that can detect pollutantsin the air.
   科学家开发了一种新型信号追踪仪器，可以检测空气中的污染物。
3. 3.The police department deployed a signal-tracing instrument to monitor traffic during the holidayrush.
   警方部署了信号追踪仪器来监测节假日期间的交通流量。