孕妇的骨盆需要定期检查以确保分娩顺利。

Pregnant women need regular checks on their ___pelvis to ensure smooth delivery.

医生通过X光检查了她的骨盆情况。

The doctor examined her ___pelvis with an X-ray.

科学家发现这些古老鱼类的骨盆结构与现代哺乳动物非常相似。

Scientists found that the ___pelvises of these ancient fish were remarkably similar to those of modern mammals.