小提琴的共鸣箱作为天然的共鸣器，放大了琴弦的振动声音。

The violin's sound box serves as a natural ___resonator to amplify the vibration of the strings.

这个电子设备中的谐振器负责产生稳定的高频信号。

The ___resonators in this electronic device are responsible for generating stable high-frequency signals.

吉他内部的木制共鸣腔增强了琴弦的振动效果。

The wooden ___resonators inside the guitar amplify the vibrations of the strings.