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。
The fetus of the diabetic gravida may also have disproportionately large shoulders and body size compared with the head.
糖尿病孕妇的胎儿也可能有与胎头不相称的肩宽或躯体过大。
Medical Images including head outline are preprocessed by using mathematical morphology, and the skeleton of fetus' head outline with an approximate rotundity can be extracted.
利用数学形态学对含有胎儿头部轮廓的医学图像进行预处理，提取近似圆形的胎儿大脑轮廓的骨架。
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