enable it to soar through the water, with the least expenditure of energy. 可以让它花费很小的力量在水里巡游
The shark can find prey far more easily than they can 鲨鱼比它们更容易发现猎物
and they'll be able to collect the scraps from it's meals. 引水鱼就收集鲨鱼咬碎的食物碎片吃
patrolling the top one hundred meters of water. 巡游高度在海平面至水下100米之间
Taste in water, is the equivalent of smell in the air. 鲨鱼能在水中“闻”到各种气味
An oceanic whitetip is able to detect even the faintest trace. 白鳍鲨更是能跟踪细微的痕迹
It specializes in locating prey in the emptiest areas of the open ocean 它擅长的是即使在最空荡的海域也能找到猎物
The dense shoals, on which so many depend gather only when water conditions are perfect. 只有在水况非常好的情况下 才会出现这样的鱼群聚集