Would you be able to sleep with one eye open? Bottlenose dolphins can. When they sleep, only half of their brain goes to sleep. They sleep with one eye open to stay safe. Half of their brain sleeps for about two hours before the other half gets a chance to sleep.
你能睁着一只眼睛睡觉吗？宽吻海豚可以。当它们睡觉时，大脑只有一半进入睡眠状态。它们睁着一只眼睛睡觉，以保证安全。一半大脑进入睡眠大约两个小时后，它们的另一侧大脑才有机会进入睡眠。
Dolphins are not fish--they are mammals. The smallest dolphin is about 50 kilos heavy, while the largest kind of dolphin weighs up to 10 tons. These mammals have lungs. They have to go to the surface of the water to get fresh air. These energetic animals can be seen near the coast, sometimes swimming alongside boats. Dolphins don't lay eggs. Their young are born alive, and they drink milk from their mothers. Dolphins are smart and brave. Some dolphins save people from shark attacks. They are able to solve many problems and even use tools to catch fish. But their cleverness doesn't end there.
海豚不是鱼类，它们是哺乳动物。最小的海豚重约 50 千克，而最大的海豚可重达 10 吨。这些哺乳动物有肺，它们必须浮出水面呼吸新鲜空气。我们可以在海岸附近看到这些精力充沛的动物，有时它们还会在船边游。海豚不产卵。它们的幼崽是活体出生的，并且会喝母亲的奶。海豚聪明勇敢，有些海豚会在鲨鱼攻击人类时救助他们。它们能解决很多问题，甚至还能使用工具捕鱼。但它们的聪明远不止于此。
Dolphins can also pass on anything they learn to other dolphins. They show great teamwork. They communicate with each other using sounds like whistles and clicks. Maybe they make sentences just as humans do! Dolphins know the “voices” of other dolphins and even know exactly from whom the sounds are. They can also know themselves in a mirror and check different parts of their bodies in it.
海豚还能把自己学到的东西传授给其他海豚。它们表现出很强的团队合作能力。它们用口哨声、咔嗒声等声音相互交流。也许它们也像人类一样会说句子！海豚能分辨出其他海豚的“声音”，甚至准确知道声音来自谁。它们还能认出镜子中的自己，并检查身体的不同部位。
However, dolphins have been facing danger from humans. There are people shooting them with their guns, causing wounds that make them bleed to death. We should protect the smart animal for a better future, not only for theirs, but also for ours.
然而，海豚一直面临着来自人类的威胁。有人用枪射杀它们，导致它们受伤，流血而亡。我们应该保护这种聪明的动物，以创造更美好的未来。这个未来不仅是它们的，也是我们的。