sound voice noise soon we heard the ____of police car

sound voice noise soon we heard the ____of police car the policemen heard the sound or noise 区分sound .voice.noise noise,voice,sound的不同 sound ,voice ,noise 的区别 voice sound noise的区别~~ voice noise sound什么区别 sound、voice、 noise的区别 we heard the noise from ____ noise,sound,voice的用法和区别 accent voice noise sound的区别 voice与sound与noise的区别