另一些人则通过已经使用多年的卡片来讲，通过磨损的边缘来判断。

Others lectured from cards that had served for years, to judge by the worn edges.

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边缘处的针脚已经开始磨损了。

The stitching had begun to fray at the edges.

《柯林斯英汉双解大词典》

这个过程是必须的，因为这不是真的拼版和用碎纸机粉碎的文档那样碎片可以完美的拼合，撕碎的文档碎片的边缘会有轻微的变形和磨损。

This is necessary because unlike a real jigsaw or a machine-shredded document, in which the pieces fit perfectly, the shreds of a torn document are slightly distorted and frayed at the edges.

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