pygidial margin

例句：

1. 1.The scientist carefully measured the pygidial margin of the animal's skull.
   科学家小心翼翼地测量了动物颅骨的关节边缘。
2. 2.The doctor used a microscope to examine the pygidial margin of the patient's skin.
   医生使用显微镜检查了病人皮肤的关节边缘。
3. 3.The researcher found that the pygidial margin of the bone was irregular in shape.
   研究者发现这块骨头的关节边缘形状不规则。