The dart is a "v" shape, with a certain width in the end, the other end is gradually reduced, the shape of "v" by the suture stitch distance is called the province wide or discount amount.
省道是“v”字形的，在其一端有一定宽度，另一端逐渐缩小为点，“v”形被缝合时线迹的距离称为省宽或折量。
Place the interfacing on the wrong side and use a catch stitch tow sew the edges of the interfacing to the stitching line of dart.
把衬布放在反面，用三角针法缝纫衬布的边，至省道的缝止线。
Place the interfacing on the wrong side, and use a catch stitch tow sew the edges of the interfacing to the stitching line of dart.
把衬布放在反面，用三角针法缝纫衬布的边，至省道的缝止线。
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