英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—2

 She pushes the camera down the slope, a tracking shot. As she films, there is no human presence of any kind. She even adjusts the camera to record her own exit.

 

She must get her cub¹ to the sea-ice before it breaks up and thaws², otherwise, they will be trapped on the island for the summer with little to eat.

 

She needs to be careful. Males roam in ice fields below. And they kill cubs³. They will try to mate with their mother, so she has their cubs instead. But the larger males find deep snow and steep slope heavy-going. She wisely keeps her cub to the higher ground.

 

Back at the den⁴ sites, other cubs are yet to emerge. They appear over a five-week period from March to April. After ten days of waiting, something stirs. The mother has waited six whole months for this moment.

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 thaws   

n.（足以解冻的）暖和天气( thaw的名词复数 )；（敌对国家之间）关系缓和v.（气候）解冻( thaw的第三人称单数 )；（态度、感情等）缓和；（冰、雪及冷冻食物）溶化；软化

参考例句：

• The sun at noon thaws the ice on the road. 中午的阳光很快把路上的冰融化了。 来自辞典例句
• It thaws in March here. 在此地化雪的季节是三月。 来自辞典例句

3 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》

4 den   

n.兽穴；秘密地方；安静的小房间，私室

参考例句：

• There is a big fox den on the back hill.后山有一个很大的狐狸窝。
• The only way to catch tiger cubs is to go into tiger's den.不入虎穴焉得虎子。