They had recently installed their lightpen system in a supermarket for stocktaking purpose.他们最近在超级市场安装了用于盘点库存的光笔系统....

lightpen的音标：lightpen的英式发音音标为：['laɪtpən]lightpen的美式发音音标为：['laɪtpən]...

n.光笔（计算机的一种输入设备）...