On the edge of the paper to reduce friction, that is, reduce mechanical wear and tear, and the durability of the tool itself.
刀与纸边的磨擦力减少，即减少对机械的磨损，而刀本身的耐用性更强。
On the edge of the paper to reduce friction, that is, reduce mechanical wear and tear, and the durability of the tool itself.
刀与纸边的磨擦力减少，即减少对机械的磨损，而刀本身的耐用性更强。
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