sound signal digital

例句：

1. 1. The sound of the waves crashingagainst the shore is soothing.
   海浪拍打岸边的声音令人心旷神怡。
2. 2. The soundof the music filled the room.
   音乐声充满了整个房间。
3. 3. The sound of the alarmwoke me up.
   闹钟的声音把我叫醒了。