pterygotus

例句：

1. 1. Pterosaurs werethe first known flying reptiles.
   翼龙是已知的第一种飞行爬行动物。
2. 2.The pteropod is a smallcrustacean that lives in saltwater.
   虾蛄是一种生活在盐水中的小型甲壳类动物。
3. 3. Pterosaursare extinct, but their fossils havebeen found in many places around the world.
   翼龙已经灭绝，但它们的化石在世界许多地方都被发现过。