How can the screen play like this?

Time:2018-01-29From:Writer:Click: 112 【Font-size:Small Large
A foreign mathematics professor applied the marker to the projection screen accidentally, and began to think of ways to solve the problem.
All kinds of ways come out, this skill is amazing, as shown in the following picture:

It is a carefully designed, Matthew Weathers the professor is not only good at mathematics but also proficient in computer, in this way, he let his classroom is full of atmosphere, let his students like mathematics.

Our company has prepared many variety of screens, and how do you want to use?

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