Conveniently, the birth canal—the bony opening in the pelvis through which the baby must travel to get from the uterus to the outside world—is also an oval shape.
Conveniently, the birth canal—the bony opening in the pelvis through which the baby must travel to get from the uterus to the outside world—is also an oval shape.
正巧产道也是卵形的（产道即骨盆的出口，是胎儿从子宫来到人世的必经之道）。