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Underwater baseplate installation in advance is needed for semi - submersible platform pre - drilling well.
半潜式平台预钻井,需要预先安装水下基盘.
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The Deepwater Horizon was a semi - submersible drilling rig used to drill new oil wells.
“深海地平线”是一种半潜水式的钻井方式,用于开挖新的油井.
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