drilling mud materials
钻井泥浆材料
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Plus the rig also must be kept at the same position, so energy must be expended fighting the ocean currents, and mud must be pumped, workers helicoptered on and off the rig, drilling materials delivered, etc.
FORBES: Petroleum Balance
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