opisthognathism

例句：

1. 1.The fossils from this region are of great importance to the study of human evolution.
   该地区的化石对研究人类进化具有重要意义。
2. 2. The researcher found that the ancient animal's opisthognathic skeleton was unique.
   研究者发现这种古代动物的头骨和脊柱结构独特。
3. 3. The team is studying the fossils to understand the evolution of mammals.
   该团队正在研究化石以了解哺乳动物的进化过程。