ursid

例句：

1. 1.The ursid was a mysterious creature that lived in the forest.
   这个未知生物生活在森林里，是个神秘的生物。
2. 2. The ursid had a unique ability to communicate with animals.
   这个未知生物有与动物沟通的独特能力。
3. 3.The ursid was discovered by scientists who were trying to study new species.
   这个未知生物是由科学家发现的，他们试图研究新的物种。