Perforatig rules: Steel rules which has a series of cuts for perforating sheet of paper.

打孔线：有着一串切口，用来在纸上打孔的钢线。

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Perforatig rules: Steel rules which has a series of cuts for perforating sheet of paper.

打孔线：有着一串切口，用来在纸上打孔的钢线。

youdao