drill string
Someone who sees an event and can report or testify about it. [from 16th c.]
Third-person singular simple present indicative form of quitch
A column of drill pipe on a drilling rig, which transmits drilling fluid and torque to the drill bit.
plural of goalscorer
掘削ビットに回転力や掘削液を伝えるドリルパイプの列は、作業全体を停止させる可能性のある故障を防ぐために定期的に点検する必要がある。
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