Sharks are one of the oldest animals on the earth.They appeared 400 million years ago. There are about 400 kinds of sharks in the world now.
Sharks are large sea animals. They are at the top of the food chain in the sea and they love eating meat.They have sharp teeth. They are very dangerous because they can attack people.
Today, people kill sharks for their meat or medical use. We must stop shark trade to protect the old species.
鲨鱼是地球上最古老的动物之一。它们出现在4亿年前。现在世界上大约有400种鲨鱼。
鲨鱼是大型海洋动物。在海洋里，它们处于食物链的顶端，它们喜欢吃肉。它们有锋利的牙齿。它们非常危险，因为它们会攻击人。
如今，人们为了鲨鱼肉或医疗用途而捕杀鲨鱼。我们必须停止鲨鱼贸易来保护这个古老的物种。
文章来源：
四季读书网
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