普通纸环具有两个面，一个正面，一个反面，两个面可以涂成不同的颜色；而莫比乌斯纸环只有一个面，一只小虫可以爬遍整个曲面而不必跨过它的边缘，整个纸环只有一种颜色。
A mobius strip is a mathematical marvel. It was discovered by German mathematician August Ferdinand Möbius in 1858.
What is exactly a Möbius strip? The Mobius strip is called a nonorientable surface. In other words, it’s a surface with only one side. Sound crazy?
怎么回事？
公元1858年，德国数学家莫比乌斯（Mobius,1790~1868）发现：把一个扭转180°后再两头粘接起来的纸条，用剪刀沿纸条的中央把它剪开，纸带不仅没有一分为二，反而剪出一个两倍长的纸圈！
今天我们带着得宜完小的老师和同学们亲自动手见证神奇的莫比乌斯环。
Making a mobius strip is so easy but fun. Students should be able to see art, math, and engineering all in this infinite loop. Mrs. Zhang showed the students at DeYi WanXiao how to craft a mobius strip out of paper and explained how the idea of a mobius strip applied in our daily life.
Every single student successfully made her/his mobius strips. They were so excited, raising the loops high in the air, waved them back and forth, exclaiming loudly, “Look, I did it!”
Check out the video below. Many thanks to Mrs. Xu, who took all the pictures and helped students locally.