These generate power and send it to a control board that operates a pair of piezoelectric actuators – clever materials that work a bit like a muscle and contract when a voltage passes across them.

它们产生电能并将其发送到控制板，该控制板操作一对压电致动器 - 聪明的材料有点像肌肉，当电压通过它们时会收缩。