又称光电笔，用光线和光电管将特殊形式的数据，如条形码记录单等读入计算机系统的一种装置，其外形类似钢笔，故通称光笔。
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当你阅读课本和笔记时，用荧光笔和便利贴提醒自己需要记住哪些关键信息。
As you read your textbook and notes, use highlighters and sticky notes to remind yourself of which key information you need to remember.
因为我们有我的红色激光笔，我们也会尝试红色激光笔，它的中心波长是 700 纳米。
Since we have my red laser pointer, we will also try with the red laser pointer, which is centered at wavelength of 700 nanometers.
如果你以另一种方式转动它，它就变成一支触控笔，再换一种方式转动，它就变成一支激光笔。
If you do it the other way, it becomes a stylus tip and in another way, it becomes a laser pointer.
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