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。
He struck the shark once more hard across the point of the nose as he slid down from the fish.
当鲨鱼从大鱼身上滑下来时，他又朝它鼻尖重重地击了一下。
Write a story about a shark from the shark's point of view. Tell how it feels to be a shark. Be sure to give details about the experience in time order.
写一篇自叙性短文，以鲨鱼的视角写一个故事，说说当鲨鱼的感觉，一定要按时间顺序写出细节。
Some shark species make "mental maps" of their home ranges, allowing them to pin-point destinations up to 50km (30 miles) away, research suggests.
研究显示，某些种类的鲨鱼对其活动范围制作出“心理地图”，这使它们可以精确达到50公里以外的目的地。
The anchor point did not itself provide the shark with the best chance of intercepting a seal.
定位点本身并不能提供给鲨鱼截杀海豹的最好机会。
The anchor point did not itself provide the shark with the best chance of intercepting a seal.
定位点本身并不能提供给鲨鱼截杀海豹的最好机会。
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