通过使用类似针状装置的扬声器进行回放，就可以将声音还原了。
Played back via a speaker using a similar needle unit, the device could retransmit the sounds.
内置话筒、扬声器、天线都使体积难以缩小，而这些新型装置也需要体积较大的电池来支持其复杂的功能。
Contributing to their size are the installed microphone, speaker, and antenna. The devices also need a larger battery to power the complex functions of the phone.
其它利用电磁铁的装置有粒子加速器、电话听筒、扬声器和电视。
Other devices that utilize electromagnets include particle accelerators, telephone receivers, loudspeakers, and televisions.
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