The primary working hypothesis was that motion preservation would reveal beneficial effects with regard to adjacent level preservation but that it might be disadvantageous with regard to the progression of the index-segment's facet joint degeneration

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The primary working hypothesis was that motion preservation would reveal beneficial effects with regard to adjacent level preservation but that it might be disadvantageous with regard to the progression of the index-segment's facet joint degeneration
The primary working hypothesis was that motion preservation would reveal beneficial effects with regard to adjacent level preservation but that it might be disadvantageous with regard to the progression of the index-segment's facet joint degeneration.

The primary working hypothesis was that motion preservation would reveal beneficial effects with regard to adjacent level preservation but that it might be disadvantageous with regard to the progression of the index-segment's facet joint degeneration
句型应该不复杂,是这样：
The primary working hypothesis was that ( ) but that ( ).
主要工作假设是（带来的好处）但同时（其不利后果是……）.
好处是对近邻节段维持有好处,不利是引起脊椎关节退化.

主系表结构。主语是The primary working hypothesis，系动词是 was；表语是一个从句，由两个并列、转折的句子组成，主语是 motion preservation

the new century primary primary primary primary primary The primary working hypothesis was that motion preservation would reveal beneficial effects with regard to adjacent level preservation but that it might be disadvantageous with regard to the progression of the index-segment's facet joint degeneration I in the primary school什么意思 working around the working in the office the ordinary working folks 的英文翻译是get to the primary school还是go to the primary school? Working in the sun .Working in the rain. The bookstore is beside the Primary School同意问句 he is the __engineer in the factorymain major chief primary Working For The Man 歌词 Working On The Highway 歌词 The fourth day on working I’m at the gym working out. 不懂working out