单语范例（未经PONS编辑处理）
These miniature microphones are often supplied with a choice of push-on grilles of differing lengths that provide gentle high-frequency boost by forming a resonant cavity.
en.wikipedia.org The tubes are carved so that they have a distinctive resonant pitch when being vibrated.
en.wikipedia.org Additionally, very loud sounds can be made by explosions directed into, or being detonated inside of resonant cavities.
en.wikipedia.org As conducting walls of the enclosing cavity approach the resonator, change in boundary conditions and field containment start to affect resonant frequencies.
en.wikipedia.org Together, these form a resonant system, and the mechanical cone resonance may be excited by electrical signals (e.g., pulses) at audio frequencies.
en.wikipedia.org