resonator
/ˈrezəneɪtə(r)/noun
1- an apparatus that increases the resonance of a sound, especially a hollow part of a musical instrument共鸣器（尤指乐器的中空部分）。
1.1
- a musical or scientific instrument responding to a single sound or note, used for detecting it when it occurs in combination with other sounds共振器。
1.2
- Physics a device that displays electrical resonance, especially one used for the detection of radio waves【物理】共振器。
1.3
- Physics a hollow enclosure with conducting walls capable of containing electromagnetic fields having particular frequencies of oscillation and exchanging electrical energy with them, used to detect or amplify microwaves【物理】共振器。