Next there's fetal lie, which describes how the fetus is positioned in the uterus.

接着是胎产式，指胎儿在子宫内的位置。

A longitudinal fetal lie is ideal, where the long axis of the fetus, which is its spine, lies along the maternal long axis—the mom's spine.

纵产式是理想的，胎儿的长轴（脊柱）和母亲的长轴（脊柱）平行。