英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—14

 This is a high-risk strategy. Like the male at the whale carcass, some bears don't do sharing. She stands up to make herself look bigger. The cub¹ copies. Luckily, this bear has no appetite for a fight. 

 

There is a feeding etiquette² around a seal carcass. Bears that approach correctly are often allowed to share, particularly if they are known. They greet.  Away from the carcass, young males often become friends, hanging out together. As ever, our spycams prove a huge hit with the curious bears. With the driftcams out of action, blizzardcam returns to frontline duties, and deploys³ backup. Snowballcam's arrival fascinates the curious bears, particularly as the steep slope gives it momentum⁴. He tries some fancy footwork, more bears join the team

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 etiquette   

n.礼仪，礼节；规矩

参考例句：

• The rules of etiquette are not so strict nowadays.如今的礼仪规则已不那么严格了。
• According to etiquette,you should stand up to meet a guest.按照礼节你应该站起来接待客人。

3 deploys   

（尤指军事行动）使展开( deploy的第三人称单数 )； 施展； 部署； 有效地利用

参考例句：

• It then deploys "decoy" programs designed to attract the virus. 然后，它释放“诱饵”去吸引病毒。
• But when that doesn't work, he deploys his secret defense mechanism. 但没有效果，它要施展绝密自卫武器了。

4 momentum   

n.动力，冲力，势头；动量

参考例句：

• We exploit the energy and momentum conservation laws in this way.我们就是这样利用能量和动量守恒定律的。
• The law of momentum conservation could supplant Newton's third law.动量守恒定律可以取代牛顿第三定律。