1. cut a female screw thread with a tap. 
   用活栓切一条螺母线。
2. locking of screw joint 
   螺纹防松
3. Screw down a seller 
   迫使卖主降低价格
4. Screw the vise tighter. 
   把钳子夹紧一点。
5. The screw has loosened. 
   螺丝钉松了。

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