pick-off signal

例句：

1. 1. The spy successfully picked up a signal from the enemy's base.
   间谍成功地从敌人的基地截获了信号。
2. 2.The military team was able to pick up signals from the enemy's radio station.
   军事团队能够从敌人的电台截获信号。
3. 3.The police were able to pick up a pick-off signal from the suspect's phone.
   警方能够从嫌疑人的手机中截获一个截获信号。