A device that converts electric signals, as from a telephone, stereo, or radio receiver, to audible sound and fits over or in the ear. 耳機一種傳遞電子信號的設備，比如從電話、立體聲或廣播接收器上傳出可聽的聲音。這種設備嵌到耳朵上或耳朵里
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. 膜片，振動板一種薄的圓盤(尤其是在麥克風和電話收話器里那種)響應聲波振動產生信號或者響應電信號振動產生聲波
