英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—18

 Calcium from the bones will help the mother's milk supply, but the cub¹ needs meat to survive.

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.

1 cub   

n.幼兽，年轻无经验的人

参考例句：

• The lion cub's mother was hunting for what she needs. 这只幼师的母亲正在捕猎。
• The cub licked the milk from its mother's breast. 这头幼兽吸吮着它妈妈的奶水。

2 cubs   

n.幼小的兽，不懂规矩的年轻人( cub的名词复数 )

参考例句：

• a lioness guarding her cubs 守护幼崽的母狮
• Lion cubs depend on their mother to feed them. 狮子的幼仔依靠母狮喂养。 来自《简明英汉词典》

3 partially   

adv.部分地，从某些方面讲

参考例句：

• The door was partially concealed by the drapes.门有一部分被门帘遮住了。
• The police managed to restore calm and the curfew was partially lifted.警方设法恢复了平静，宵禁部分解除。

4 remains   

n.剩余物，残留物；遗体，遗迹

参考例句：

• He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
• The remains of the meal were fed to the dog.残羹剩饭喂狗了。

5 backbone   

n.脊骨，脊柱，骨干；刚毅，骨气

参考例句：

• The Chinese people have backbone.中国人民有骨气。
• The backbone is an articulate structure.脊椎骨是一种关节相连的结构。

6 triumphant   

adj.胜利的，成功的；狂欢的，喜悦的

参考例句：

• The army made a triumphant entry into the enemy's capital.部队胜利地进入了敌方首都。
• There was a positively triumphant note in her voice.她的声音里带有一种极为得意的语气。

7 regain   

vt.重新获得，收复，恢复

参考例句：

• He is making a bid to regain his World No.1 ranking.他正为重登世界排名第一位而努力。
• The government is desperate to regain credibility with the public.政府急于重新获取公众的信任。