几十年以来，科学家们已经能够将电能灌入压电材料，以用于环境传感器、扬声器与其他设备。
For decades, scientists have pumped electricity into piezoelectric materials for use in environmental sensors, speakers and other devices.
这将允许其他参与者通过他们的计算机扬声器收听bob的声音，而不是另外发起单独的语音会议。
Doing so allows other participants to listen to Bob's audio through their computer speakers, rather than dialing into a separate audio conference.
同真的iPhone一样，这款 “苹果桌子”的扬声器在机身下部，由一个重低音喇叭和两个中高音喇叭及其他两个喇叭组成。
Just like a real iPhone the speakers are at the bottom of the case, only these ones are powered with a subwoofer, two mid range tweeters and two other speakers.
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