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关注：1
2013-05-23 12:21
求翻译：Ribis and Robis are, respectively, the frames of basis bbis centred at O2 and O1, respectively. The basis bbis is defined as ibis normal to the bisecting plane and jbis along OB.是什么意思？ 待解决
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Ribis and Robis are, respectively, the frames of basis bbis centred at O2 and O1, respectively. The basis bbis is defined as ibis normal to the bisecting plane and jbis along OB.
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