英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—18

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Now they have another problem. Other bears can't be trusted with small cubs². But fortunately they seem more interested in what lies beneath the surface. It looks like there is still meat to be found here, partially³ preserved by the cold water.

Despite her hunger, the mother can't risk joining in. But the other bears don't stay long. The mother grasps her opportunity, Her cub's survival depends on her success. The remains⁴ lie four meters down. And, at the deepest point, flesh still clings to the backbone⁵. She emerges triumphant⁶.

The meat must be rancid, but it's still a lifesaver. She brings some back to the shore. This is the moment the cub has been waiting for, but still he has to wait. However, unfair it seems, she must regain⁷ her strength or her cub won't survive anyway.

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