But some crystalline materials don't possess a center of symmetry making them candidates for piezoelectricity.
但是一些晶体材料不具有对称中心,这使它压电性的候者。
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.
已有车站使用乘客的脚步检票口和显示屏供电,还有一个舞蹈俱乐部使用压电技术灯供电。
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