spiral marking

• 螺纹

spiral marking的用法和样例：

例句

1. Something,such as the thread of a screw or the spiral condenser in a still,that resembles a worm in form or appearance.
   有螺纹状的物品某物，如螺旋线或蒸馏器的螺旋冷凝器，在构成或外表上像蠕虫。
2. The continuous spiral thread upon the deformed reinforcing bar is formed by eliminating portions of longitudinal ribs that are formed upon the reinforcing bar during manufacturing.
   在该异形加强筋上的连续的螺旋形螺纹是通过去除在制造过程中在该加强筋上形成的部分纵向肋而形成的。