河马在英语中被称为"Hippopotamus"。
Hippopotamus 来源于希腊语，由"hippos"和"potamos"组成，分别意为"马"和"河"。
例句：
The hippopotamus is a large mammal that pves in Africa.
(河马是生活在非洲的大型哺乳动物。)
The hippopotamus is considered to be one of the most dangerous animals in Africa.
(河马被认为是非洲最危险的动物之一。)
The hippopotamus is known for its aggressive behavior and powerful jaws.
(河马以其攻击性行为和强大的下巴而闻名。)