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light pen

noun
🔊/ˈlaɪt pen/
🔊/ˈlaɪt pen/
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  1. a piece of equipment, like a pen in shape, that is sensitive to light and that can be used to pass information to a computer when it touches the screen （用于向计算机输入信息的）光笔
  2. a similar piece of equipment that is used for reading barcodes光笔；条码识读器