Some residents and visitors in the small city of Taos, New Mexico, have for years been annoyed and puzzled by a mysterious and faint low-frequency hum in the desert air.

• 多年以来，美国新墨西哥州小城市陶斯的部分居民和访客一直被沙漠空气中一种微弱的低频噪声所困扰。