hidden microphone

• 窃听器

hidden microphone的用法和样例：

例句

1. The probe microphone was a large, high-sensitivity microphone.
   探头窃听器是一种大型高灵敏度窃听器。
2. I set up to persuade the Admiralty to carry the development costs of the new microphone.
   我着手劝说海军部承担我的窃听器的研制费用。