单词	electret
释义	electret /ɪˈlɛktrɪt / noun Physics A permanently polarized piece of dielectric material, analogous to a permanent magnet.There are mini headphone and microphone jacks - the unit includes a pair of headphones with a tiny electret mic attached on a boom - and a proprietary USB jack with cable supplied.... The electret microphone (range, 20 to 25,000 Hz within three decibels) was fixed in a polyester cover. A small electret condenser monaural microphone is found on the top panel next to its speaker, so you can annotate each image with your own voice. Origin Late 19th century: blend of electricity and magnet.
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