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A child writesonablackboardatthe Namatwae ABEK Learning Centre in Moroto District in northeastern Uganda. unicef.org unicef.org 在乌干达东北部莫罗托区的纳马夸ABEK学习中心,一名儿童在黑板上写字。 unicef.org unicef.org Just as I expected, I heard from the news today that the school is ...
no need for a marker and chalk to write; any objects can be used as writing tools, even your fingernail. No dust pollution, green and clean, and good for users' health.3. No backlight & No radiationThe handwriting is reflected by natural light, with no blue light and radiation; even ...
An electronic blackboard includes a writing sheet which extends between a pair of rollers, partly wound therearound, a CCD image sensor for scanning the surface of the writing sheet which is illuminated by a lamp, and a control system in... ...