VERB
偶然听到；无意中听到；偷听到
If you overhear someone, you hear what they are saying when they are not talking to you and they do not know that you are listening.
例句
I overheard two doctors discussing my case.
我无意中听到两位医生讨论我的病情。
...snatches of overheard conversation.
偷听到的片言只语