But some crystalline materials don't possess a center of symmetry making them candidates for piezoelectricity.
但是体材料不具有对称中心,这使它们成为压电性的候者。
There are already train stations that use passengers' footsteps to power the ticket gates and displays and a dance club where piezoelectricity helps power the lights.
已经有火车站使用乘客的脚步为检票口屏供电,还有个舞蹈俱乐部使用压电技术为灯供电。
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