receiver retrace trigger

例句：

1. 1.The phone is a device that receives and transmits signals.
   电话是一种接收和发送信号的设备。
2. 2. The receiver is the part of the radio that picks up the signal.
   接收器是收音机中接收信号的部分。
3. 3.The receiver is responsible for converting the sound into an electrical signal.
   接收器负责将声音转换为电信号。
4. 1. We need to retrace our steps and try again.
   我们需要重新走一遍，再试一次。
5. 2. She retraced her steps to find the lost key.
   她重新走了一遍，找到了丢失的钥匙。
6. 3. The detective retraced his memory to solve the case.
   侦探重新回忆记忆，以解决这个案件。
7. 1.The gun was the trigger for the explosion.
   枪是爆炸的触发器。
8. 2. The sudden drop in oil prices triggered a recession.
   石油价格的突然下跌引发了经济衰退。
9. 3. The child's laughter was the trigger for her mother's anger.
   孩子的笑声引起了母亲的愤怒。