suction socket for suspension 释义：吸着式悬吊接受腔 internal socket 释义：内接受腔 bone conduction speech reception thresh-old test 释义：骨导言语接受阈试验 ..
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The Logitech, Bose and Geneva Sound units all have internal batteries, so you can run them for a few hours without the need for a wall socket.
WSJ: Bluetooth Speakers: The Untethered Sound System
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