... 落锻 drop forging 下伸线(小楷字母) drop line 点圆规 drop pen ...
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三上四下曲线牵伸 three over four curvilinear draft
下伸线
Downward extension line
以上为机器翻译结果，长、整句建议使用 人工翻译 。
方法对下颈椎不稳症21例均采用正侧双斜位及摄X线动态颈椎侧位过曲过伸片。
Methods X-ray posteroanterior, lateral, double-oblique and dynamic lateral overflexional and overextensive views were performed on 21 patients.
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