Technically, back labor occurs when the fetus is in a posterior position, with its face up and the back of its head pressing against your sacrum, or the back of your pelvis.
从技术上来说，背阵痛发生在胎儿处于背对的位置，它的脸朝上而后脑勺紧靠你的骶骨或者骨盆后方。
Assessment of the fetus consists of estimating fetal weight and position. Estimations of fetal size, even those obtained by ultrasonography, are frequently inaccurate.
评价胎儿包括胎儿体重和位置。对胎儿大小的估计，即使是超声学获得的结果经常都不准确。
The sections will all be presented with the fetus in a cephalic dorsal position (Figure 1).
本部分中胎儿的先露位置均为头侧仰卧位（图1）。
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