Definition: to secretly listen to someone else's conversation Level: C2
我怀疑有人一直在窃听我们的私人讨论。
I suspect someone has been ___listening ___in on our private discussions.
她决定窃听同事们的对话。
She decided to ___listen ___in on her colleagues' conversations.
当局有时可以窃听可疑的通讯。
Authorities can sometimes ___listen ___in on suspicious communications.
