placodont

例句：

1. 1. The discovery of the first fossils in the Cambrian period is often attributed to the work of a paleontologist named Charles Darwin.
   查尔斯·达尔文因发现寒武纪化石而闻名。
2. 2. Placodonts are characterized by their unique adaptations for life in the desert.
   板齿兽以其适应沙漠生活的独特特征而著称。
3. 3. The extinction of the last platodons occurred around 66 million years ago.
   最后一种板齿兽灭绝发生在约6600万年前。