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.
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