河马

例句：

1. 1. Hippos are found in the African savannahs.
   河马在非洲草原上被发现。
2. 2. The hippo is a large mammal with a long trunk and short legs.
   河马是一种大型哺乳动物，有长鼻子和短腿。
3. 3. Hippos are known for their unique ability to swim underwater.
   河马以其独特的水下游泳能力而闻名。