- three start screw
- three-start screw
- three-start thread
- triple threaded screw
- 三: three
- 头: 5点就得动身 have to start before ...
- 螺纹: screw thread; flight; helica ...
- 三头螺线螺旋: triple flight auger; triple-flight auger
- 单螺纹,单头螺纹: single screw thread
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