Inefficient uterine action should be corrected before attributing dystocia to a pelvic problem.

在骨盆问题引起的难产前，无效的宫缩应该加以纠正。

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Objective: to survey the normal values of pelvic inclination of external pelvimetry and to provide evidence so as to estimate dystocia risk index for antenatal care.

目的：测量骨盆倾斜度外测量正常值，为产前检查估计难产风险指数提供依据。

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