Some Facts That May Surprise You about Sharks  一些有关鲨鱼的冷知识

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Sharks are scary animals in the ocean， primarily for their big size and sharp teeth. Sharks have been around for hundreds of millions of years， and while they continue to evolve， they are also in grave danger. However， humans are a larger threat to sharks than sharks are to us. There are more than 500 species of shark. Given that there are a large number of unique species， some characteristics may be true for one species， but not another.

鲨鱼是海洋中令人闻风丧胆的动物，主要是因为它们巨大的体型和锋利的牙齿。（剩余3023字）