河马是一种又大又重的动物，它们有着圆圆的身体，短短的腿和宽宽的嘴巴。河马喜欢在水中生活，因为它们的皮肤容易干燥。它们可以在水下呆很长时间，因为它们可以屏住呼吸。河马是非常强壮的动物，它们可以轻易地摧毁树木和草丛。虽然它们看起来非常温和，但它们的攻击力是非常强的，所以人们不应该靠近它们。

英语翻译：

Hippos are large and heavy animals with round bodies, short legs, and wide mouths. They prefer to live in the water because their skin is prone to drying out. They can stay underwater for a long time because they can hold their breath. Hippos are very strong animals and can easily destroy trees and grass. Although they look very gentle, their attacks are very strong, so people should not get too close to them.