1. a wrench for turning a tap to create an internal screw thread. 
   旋转活栓产生内螺纹的扳手。
2. a small square or hexagonal metal block with internal screw thread to be fitted onto a bolt. 
   内侧有螺纹儿、可以被固定到螺栓上的方形或六边形金属块。
3. cut a female screw thread with a tap. 
   用活栓切一条螺母线。
4. 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
5. a shaft with screw thread (the worm) meshes with a toothed wheel (the worm wheel); changes the direction of the axis of rotary motion. 
   螺纹杆与齿轮相啮合；改变轴旋转运动的方向。

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