light pen

美 
英 
  • na.【电】光笔
复数:light pens  
light-pen
n.
1.
(用于向计算机输入信息的)光笔a piece of equipment, shaped like a pen, that is sensitive to light and that can be used to pass information to a computer when it touches the screen
2.
光笔;条码识读器a similar piece of equipment that is used for reading barcodes

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