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to phrases
rotary bit
dril.
牙轮钻头
oil
旋转钻头
tech.
旋转钻
(头)
;
旋转刀片
;
回转钻进钻头
rotary bit
:
20 phrases
in 5 subjects
Drilling
1
Engineering geology
2
Geology
1
Oil / petroleum
2
Technology
14
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