While there are numerous types of sharks, only four are most frequently cited in encounters with humans—the bull shark, the tiger shark, the great white shark and the oceanic white tip shark.

鲨鱼的种类有很多，而经常被载攻击人的只有四种 – 牛鲨（学名白真鲨）、虎鲨（学名居氏鼬鲨）、大白鲨（学名噬人鲨）、白鳍鲨（学名灰三齿鲨）

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LARGE sharks, such as the Great White and Tiger, generally prey on big Marine mammals.

体型较大的鲨鱼，比如大白鲨和虎鲨，一般以大个头的海洋哺乳动物为食。

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Tiger sharks and bull sharks are common in the Gulf of Mexico, but it's rare to see a great white, and the oceanic white tip sharks are almost never seen in shallow waters.

虎鲨和牛鲨是在墨西哥湾比较常见的两种鲨鱼，大白鲨比较少见，而白鳍鲨几乎不出现在浅水区。

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Tiger sharks and the occasional great white and whale shark can be seen farther out to sea.

BBC: Protecting sharks off Florida��s eastern coast