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关注：1
2013-05-23 12:21
求翻译：Since the edges were given orientations, we have to take this into account when we determine how two curves are linked. If you had made a clockwise turn in the ribbon before joining the ends and cutting, the topological relationship would be opposite to that which would occur had you first twisted it counterclockwise. 是什么意思？ 待解决
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- 离问题结束还有
Since the edges were given orientations, we have to take this into account when we determine how two curves are linked. If you had made a clockwise turn in the ribbon before joining the ends and cutting, the topological relationship would be opposite to that which would occur had you first twisted it counterclockwise.
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