sound level signal

例句：

1. 1.The sound level signal is critical for maintaining communication in noisy environments.
   声级信号对于在嘈杂环境中保持通信至关重要。
2. 2.The sound level signal was used to determine the location of the lost aircraft.
   声级信号被用来确定失事飞机的位置。
3. 3.The sound level signal was transmitted through a wireless network to monitor the noise levels in the city.
   声级信号通过无线网络传输，用于监测城市内的噪音水平。