- double agitator
- 双: two; twin; both; dual
- 铰刀: broach; fraise; reamer; ream ...
- 铰刀: broach; fraise; reamer; reamer bit; rymer
- 双铰的: double hinged
- 双铰拱: arch higned at ends; arch hinged at ends; double hinged arch; double-hinged arch; two hinged arch; two-hinged arch; two-pinned arch
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