膜片，振动板一种薄的圆盘（尤其是在麦克风和电话收话器里那种）响应声波振动产生信号或者响应电信号振动产生声波

A thin disk, especially in a microphone or telephone receiver, that vibrates in response to sound waves to produce electric signals, or that vibrates in response to electric signals to produce sound waves.