- double tip
- 双: two; twin; both; dual
- 螺纹: screw thread; flight; helica ...
- 螺杆: screw; spiral; screw arbor; ...
- 头部: head; cephalosome; nosecone; ...
- 双螺纹螺杆: double lead screw; double pitch screw; double-cut screw; double-flight screw; two-flight screw
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