There are nearly 400 different types of sharks.but only about 30 types have ever been reported as attacking human beings.Most people know that the most dangerous shark is the great white shark,mainly because they have seen the movie'Jaws'.However,there are still two other sharks which are fierce.They are the tiger shark and the bull shark.
比较简单我手翻下：世上大约有400种鲨鱼,但据报道只有30种攻击过人类.许多人是因为看了电影“大白鲨”就觉得只有大白鲨才危险,但实际上还有另外2种凶鲨：虎鲨和公牛鲨.