弯针机构与成圈叉机构是暗缝缝纫机的两个重要机构。
Bend needle mechanism and looper mechanism are two important mechanisms in blind stitching machine.
叶15～20，卵形到倒卵形或倒披针形，有锐尖或钝圆，6×2.7厘米，3毫米厚，深橄榄绿色微染紫色，有横向和纵向的暗纹。
Leaves 15 - 20, ovate to obovate or oblanceolate, acute or obtuse, 6 x 2.7 cm, to 3 mm thick, dark olive green tinged purple, with transverse and longitudinal markings.
常见的表扣有以下几种：钩扣、暗扣、蝴蝶扣、皮带按扣、折叠安全扣、折叠扣、针扣。
Common are the following: buckle hook buckle, buttons, snaps, folding belt, butterfly clasp, buckle, buckle folding.
虽然针迹不是最牢固，但暗缝缲边线迹在衣片的正反面都看不见。
Though not the strongest of stitches, the slip hem is invisible on both right and wrong sides of the garment.
虽然针迹不是最牢固，但暗缝缲边线迹在衣片的正反面都看不见。
Though not the strongest of stitches, the slip hem is invisible on both right and wrong sides of the garment.
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