pelvimeter

例句：

1. 1.The doctor used a pelvimeter to measure the baby's size.
   医生使用一个骨盆测量器来测量婴儿的大小。
2. 2.The pelvimeter showed that the baby was growing well.
   骨盆测量器显示婴儿生长得很好。
3. 3. During labor, the pelvimeter helped doctors determine the baby's position.
   在分娩过程中，骨盆测量器帮助医生确定婴儿的位置。