龟

例句：

1. 1. The turtle is a popular pet in many countries.
   乌龟是许多国家受欢迎的宠物。
2. 2. The turtle has been used as a symbol of wisdom for centuries.
   乌龟被用作智慧的象征有几个世纪了。
3. 3. The turtle was the first animal to be domesticated by humans.
   乌龟是人类最早驯化的第一种动物。