The last 7 to 10 joints of casing were back-reamed about 3 m的翻译是：什么意思？中文翻译英文，英文翻译中文，怎么说？-青云在线翻译网

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匿名	关注：1 2013-05-23 12:21 求翻译：The last 7 to 10 joints of casing were back-reamed about 3 meters to improve cutting removal from the annulus是什么意思？待解决悬赏分：1 - 离问题结束还有 The last 7 to 10 joints of casing were back-reamed about 3 meters to improve cutting removal from the annulus 问题补充：

匿名	2013-05-23 12:21:38 套管的最后7至10的关节被背扩约3米，以改善从所述环形切割去除

匿名	2013-05-23 12:23:18 框前7到10联接后面被扩大大约3米改进从环体的切口撤除

匿名	2013-05-23 12:24:58 框前7到10联接被扩大大约3米改进从环体的切口撤除

匿名	2013-05-23 12:26:38 套管的最后 7 到 10 关节被背扩约 3 米，提高切削去除从环

匿名	2013-05-23 12:28:18 casing 的最后 7 至 10 个关节被回撇去表面奶油大约 3 米从环形物中改善尖利的删除

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求翻译：The last 7 to 10 joints of casing were back-reamed about 3 meters to improve cutting removal from the annulus是什么意思？