用英语这样介绍海豚
Dolphins live in groups,and speak to each other in their own language.That is a high sound and many singers love to learn this beautiful “song”.Their sound seems to have different functions,such as warning each other of danger or showing kindness to others. Dolphins also use sound to help them find their way around, and to help them find food. In this way they are like other animals,such as bees and birds.But dolphins are very different from almost all land animals. We now know they do not use their ears to receive their sounds,but the lower part of the mouth,called the jaw.Dolphins have bigger brain in proportion to their body size than humans have and they live a long life—at least 20 or 30 years.
