Block vertebrae occur when there is improper segmentation of the vertebrae, leading to parts of or the entire vertebrae being fused.
脊椎分节不全指不当分割的椎骨导致的部分或整个椎体的融合。
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The block can be eliminated in the filter of magnesia fused mass at present because the filter orifice plate can be self-purified in use, accordingly the labor productivity is improved greatly.