Pole Piece A solid piece of steel which protrudes up through the magnet into the voice coil assembly, concentrating the energy from the magnet.是什么意思_Pole Piece A solid piece of steel which protrudes up through the magnet into the voice coil assembly, concentrating the energy from the magnet.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句