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| SCRAPBOOK | |
| 摘 要： | Strip tease Cut a Iongish strip of paper.Put the two ends together to make a circle,but beforeyou stick the ends together,turn one of them over to introduce a twist into the circle.Youhave now created a Mobius strip,which has the unusual property of only having one side!Check it for yourself by starting at any point and drawing a line along the middle of the stripKeep going until you come back to the place you started. |
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