beep tone

例句：

1. 1. The bee was busy buzzing around the flower.
   蜜蜂忙着在花周围嗡嗡作响。
2. 2. The beep tone on the phone is annoying me.
   电话上的蜂鸣声让我很烦。
3. 3. The beep tone signaled that the train had arrived.
   蜂鸣声标志着火车的到来。