英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—10

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He swims, hardly making a sound, reaching six miles per hour at times. His front legs provide propulsion, while his back legs steer². His low profile makes him seem like a floating sliver³ of ice. He checks the seal's position and takes 

 

wind direction into account to work out his final approach. As he closes in, he makes a clever move, diving deep beneath the ice floe¹. He emerges on the blind side of the seal. 

 

So far, so good.

 

He can hold his breath for minutes and calculate the seal's exact position. 

 

Slo-mo reveals just how close he got. His skills show a remarkable⁴ intelligence at work. He hunted in all three dimensions, making full use of the opportunities offered by water and ice.

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