Marine biologists say there is little research into the causes of shark attacks but point to several possibilities, all linked to humans themselves.
海洋生物学家认为尽管目前少有研究深入探询鲨鱼袭击的背后原因，但种种现象表明人类自身难逃干系。
Its oxymoronic-sounding name alone conjures up visions of a shark from a Disney movie—a fluffy, fun little animal that wags its fin like Pluto wags its tail.
仅仅是它那形象的名字就足以让我们想到一部迪士尼电影中的一条鲨鱼--一只毛茸茸的有趣的动物，抖动起鱼鳍来就像冥王星拖着长长的尾巴。
Earth for thousands of years, and have changed very little. A shark is a fish.
生存了几千年，但变化很小。
The shark-like animal belongs to the mysterious and little-studied chimaeras, perhaps the oldest group of fish alive today.
这种鲨鱼状的动物属于神秘的银蛟类。 银蛟可能是现存最古老的鱼类之一，人类对它的研究少之又少。
Unlike the skin of whales and manatees, shark skin doesn't pick up algae or barnacles. This seems to be due to little scales called "dermal denticles."
与鲸类和海牛这些海生哺乳动物不同，鲨鱼的皮肤不会附生海藻或藤壶，这可能要归结于其皮肤上被称之为“肤齿”的微小鳞屑。
Despite this distinctive profile, scientists know very little about Rhincodon typus—the whale shark.
尽管鲸鲨（学名为鲸鲨属鲸鲨Rhincodontypus）这种特殊的外形，科学家们对它们还是了解少之又少。
Cuba reports that it lands 700 tons of sharks a year, which is only a little less than the entire commercial shark fishery in the southeastern United States.
古巴报告到，其每年收获700吨鲨鱼，这只比美国东南部整个商业鲨鱼渔场的总量少一点。
Shark is the only fish in the sea that has no pneumatocyst, which means that it will swim to the bottom or even die if stopping swimming for a little while.
没有气囊的鱼，只要停止游泳一小会儿，它就会沉下去甚至会死掉。
Shark is the only fish in the sea that has no pneumatocyst, which means that it will swim to the bottom or even die if stopping swimming for a little while.
没有气囊的鱼，只要停止游泳一小会儿，它就会沉下去甚至会死掉。
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