有趣的纸环

2023-02-13

今天，老师来到教室，只见她从包里拿出纸条。我们百思不得其解，一个心想：“老师拿纸条干什么呢

Today, the teacher came to the classroom and saw her take out the note from her bag. We couldn 't think of an answer. One thought, "what does the teacher do with the note

然后，老师用胶水把纸条粘成了一个纸环，说:“老师把这个纸环剪一圈，你们猜会变成几个环？”“两个！”同学们异口同声的说。果然变成了两个环。

Then, the teacher glued the paper strip into a paper ring and said, "cut this paper ring once, how many rings do you think it will become?" "Two!" The students said in unison. It turned into two rings.

接着，老师又做了一个环，但不同的是，这个环被拧了一下，老师说：“这下剪开有几个环呢？”同学们七嘴八舌的说：“一个，两个，三个……”只见老师小心翼翼的剪开，环还是一个，但是这个环大了一倍，我们惊讶的呆住了，我问：“老师，这是怎么回事呢？”老师说：“这就是著名的莫比斯纸环，它只有一个面。”

Then, the teacher made another ring, but the difference was that the ring was twisted. The teacher said, "how many rings are there in this cut?" Students said: "one, two, three..." Only saw the teacher carefully cut open, ring or a, but this ring is twice as big, we were surprised to stay, I asked: "teacher, how is this going?" The teacher said, "this is the famous Mobis paper ring. It has only one side."

“一个面？”我不信，说：“老师您给我们证明一下吧！”只见老师用笔把纸环画了一圈，我们看见纸环两面都有线，心想：真奇妙的纸环。

"A face?" I don't believe it, said: "teacher, please prove it to us!" I saw the teacher draw a circle of paper ring with a pen, we saw both sides of the paper ring are wired, thinking: what a wonderful paper ring.