Can dolphin( 海豚 ) talk? May be they cannot talk with words, but they talk with sounds. They show their feeling with sounds. Dolphins travel in a group. We call a group of fish a “school” (群) . They do not study, but they travel together. Dolphins are mammals (哺乳动物) , not fish, but they swim together in a school. Dolphins talk to other dolphins in the school. They give information. They tell when they are happier, sad or afraid. They said “Welcome” when a dolphin comes back to the school. They talk when they play. They make a few sounds above water. They make many more sounds under water. People cannot hear these sounds because they are very very high. Scientists make tapes of these sounds and study them. Sometimes people catch a dolphin for a large aquarium (水族馆) , (an aquarium is a zoo for fish). People can watch dolphins in a show. Dolphins do not like to be away from the school in an aquarium. They are sad and lonely. There are many stories about dolphins they help people. Sometimes they save somebody’s life. Dolphin meat is good, but people don’t like to kill them. They say that dolphins bring good luck. Many people believe this.