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When we are sewing, we need to cut the line.But sometimes we can not find the scissors or no scissor, it will be with the teeth. So, we will open a spool of a crack in order to cut the line. So that the user is no longer with the teeth or scissors. This seam can also be used to make the line card ports, so that the line will not be a mess, easy to fixed storage and next use.
Xiamen University of technology