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一个普通的绳子是通过一个盒子
移动盒子切割绳子。
绳子可以按照观众的意见立即切割成两条。
这两个切口两端清晰可见。
这条绳子可以马上恢复，并拿出来交予检查。
https://v.youku.com/v_show/id_XMTQ2NTU2MzkyOA==.html?spm=a2h0k.11417342.soresults.dtitle
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Zig Zag Rope
An ordinary rope is passed through a rope cutting case. The rope can be instantly cut into two anywhere along its length at the spectator's command. The two cut ends are clearly visible. The rope is then restored and handed out for inspection.
