For many years scientists believed that the chimpanzee was the most intelligent animal in the world, but now they are not so sure. Recently they have learned that dolphins are very clever animals, too. Perhaps they are more intelligent than chimpanzees.
Many people think the dolphins are fish, but this is not true. Dolphins are different from fish in many important ways. They are mammals. They are warm - blooded, and they cannot stay under water all the time like fish. They breathe air. They must come to the surface of the water and take in air every few minutes.
Dolphins live in groups, or “school”. Schools of dolphins travel and catch fish together, and they also use a kind of language. Scientists do not understand the language of dolphins, but they know that these animals can “talk” to each other and send messages under water.
Dolphins are very friendly to human beings, and they are helpful, too. In the past few years, scientists and other people have taught dolphins to play games and to help men in many ways.
In some ways dolphins are like dogs. But they are a lot more intelligent. Perhaps they will soon become the most useful animals in the world.

许多年前科学家们认为黑猩猩是世界上最聪明的动物, 但他们现在却不再那么肯定了。最近他们发现, 海豚也是非常聪明的动物。也许他们比黑猩猩聪明的。
许多人认为海豚是鱼, 但这是不对的。海豚在许多重要的地方与鱼是不同的。他们是哺乳动物。他们是暖血的, 并且他们无法象鱼一样一直停留在水下。他们呼吸空气。他们必须每隔几分钟来到水面的空气中。
海豚是群居的, 或 “部落居住”．部落里的海豚一起旅行和捕鱼, 并且他们使用同一语言。科学家不了解海豚的语言, 但是他们知道这些动物在水下能互相“谈话” 和送信。
海豚对人是非常友好的, 并且他们也是有用的。在过去几年, 科学家和人民用许多方式教会了海豚演奏和帮助人。
海豚在一些方面是象狗。但他们是更加聪明的。或许他们很快将变成世界上最有用的动物。


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翻译不容易,希望及时处理问题,谢谢!