[請問] 教學用具名稱，可在簡報螢幕上寫字
大學時在課堂看教授使用過，就是教授能使用一種筆（外觀像麥克筆）
直接在課程投影片上將要講的重點圈起來，到下一張簡報時能直接擦掉
想請問這種教材的販售名稱？另外需要搭配特殊的螢幕和投影機嗎？
謝謝
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