... folded laser 折叠式激光器 folded riser 折叠提升管 folded trolley 折叠车 ...
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folded d riser 折叠提升管
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When the Deepwater Horizon sank, this riser collapsed and folded in on itself, but did not sheer off from the blowout preventer.
当钻井平台下沉时,立管倒塌,自动弯折,但不会转离防喷器。
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