Whales live in the ocean, but they are not fish.
鲸鱼生活在海洋里，但它们不是鱼。
They are mammals, just like humans, dogs, and elephants.
它们是哺乳动物，就像人类、狗和大象一样。
Unlike fish, whales do not have gills.
和鱼类不同，鲸鱼没有鳃。
They have lungs and must breathe air.
它们有肺，必须呼吸空气。
Whales cannot breathe underwater.
鲸鱼不能在水下呼吸。
They swim up to the surface to take in air.
它们需要浮上海面换气。
Whales breathe through a hole on top of their heads.
鲸鱼通过头顶的喷气孔呼吸。
This hole is called a blowhole.
这个孔叫做喷气孔。
When a whale exhales, it blows out water and air, creating a spout.
当鲸鱼呼气时，它会喷出水和空气，形成水柱。
Baby whales drink milk from their mothers.
小鲸鱼会喝母鲸的奶。
This is another reason why whales are mammals.
这也是鲸鱼是哺乳动物的原因之一。
Whales are warm-blooded, which means their body temperature stays the same.
鲸鱼是恒温动物，它们的体温不会随环境变化。
Fish, on the other hand, are cold-blooded.
而鱼类是冷血动物。
Some whales, like blue whales, are the largest animals on Earth.
一些鲸鱼，比如蓝鲸，是地球上最大的动物。
Whales use sounds to communicate with each other.
鲸鱼用声音相互交流。
They can make long, deep calls that travel far in the ocean.
它们可以发出低沉而悠长的声音，在海洋中传播很远。
Whales are intelligent and social animals.
鲸鱼是聪明而有社交性的动物。
Now you know that whales are mammals, and they need to breathe air like us!
现在你知道鲸鱼是哺乳动物，并且和我们一样需要呼吸空气了！
