a murmur of voices的用法和样例：
- There was a load murmur of voices in the kitchen.
- Spoke in a murmur; the murmur of the waves.
- A murmur of pain broke from her lips.
- There was a murmur of recognition.
- There was a murmur of conversation in the room.
- a murmur of conversation, of voices from the next room, etc