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The shark's skin isn't covered with scales, like other fish: instead the skins covered with barbs, giving it a rough texture like sandpaper.
鯊魚的皮膚不像其他魚類一樣由鱗覆蓋。相反，它的皮膚布滿了倒鉤，形成砂紙一樣的粗糙質地。
As you know, sharks are very quick swimmers.
如你所知，鯊魚是游泳健將。
This is made possible by their fins, one set at the side and another set underneath the body, and the tailalso helps the shark move forward quickly.
這歸功于它的鰭，一組在一側，另一組在身體下面，尾巴也幫助鯊魚快速的向前移動。
Unlike other fish, sharks have to keep swimming if they want to stay at a particular depth, and they rarely swim at the surface.
與其他魚類不同，如果鯊魚想停留在某一特定的深處就得不停的游，它們很少在海面游。
Mostly, they swim at the bottom of the ocean, scavenging and picking up food that’s lying on the ocean floor.
多數情況下，它們在海底游弋，搜尋捕食海底的食物。
While most other animals, including fish, hunt their prey by means of their eyesight, sharks hunt essentially by smell.
多數動物，包括魚類都用它們的視力捕食，而鯊魚基本上靠嗅覺。
They have a very acute sense of smell - and can sense the presence of food long before they can see it.
它們的嗅覺十分敏銳，可以探測到視力范圍很遠以外的食物。
