我们并不知道是否会鉴证历史，因为，在您看到那样的一个曲线时，那种上升的指数曲线往往会再次倾斜下滑。

And we didn't know whether we were going to be looking at history or not because when you look at a curve like that, an exponential curve going up can often just tilt over and crash back down again.

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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。

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.

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