1. The spirally threaded shaft of a worm gear. 
   螺纹蜗轮的刻有螺旋线的柄
2. 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。
3. mulberry silk worm cocoon 
   桑蚕茧
4. elementary theory of shaft 
   轴的基本理论
5. ground pressure around shaft 
   立井地压

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