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单词 roller bit
释义

roller bit

noun
1 Saddlery a kind of bit with a rotating ball or bead fitted on the mouthpiece.
2 Mechanics a drilling bit in which the cutting teeth are on rotating conical or circular cutters, used chiefly in the oil industry.

Origin

Mid 19th century; earliest use found in Household Words.

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更新时间:2025/3/23 13:07:07