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The fixed button serves as reverse stitch button in sewing and as mending stitch button when sewing stops. it works perfectly well in either programmed sewing or reverse sewing by hand.
该按纽在缝纫时为倒缝按纽，在停止缝纫时可作补针按纽。不论是进行程序缝纫还是手工倒缝，皆灵活自如。
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