hum pattern

例句：

1. 1. The hum of the beesis a sign of spring.
   蜜蜂的嗡嗡声预示着春天的到来。
2. 2. The hum of conversation filledthe room.
   谈话声充满了房间。
3. 3. The hum oftraffic outside the window was distracting.
   窗外交通的嗡嗡声分散了我的注意力。