英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—5

 She's aware of his difficulties and uses her body as a shield. She must stay attentive¹ if her cub² is to survive in this harsh Arctic world. Realizing he's exhausted³, she digs a hollow to rest him. In the dens⁴ like this, she suckles him six times a day. 

 

Meanwhile the courting male is yet to prove he's up for the job. But the female doesn't like being ignored. She tries to reignite his passion. Time to turn up the heat. He's certainly interested now. She's falling head over heels for him. He's now totally captivated. But still she gives him the runaround. But in courtship, there are always casualties.

 

Blizzard-cam is at the bear's mercy.

1 attentive   

adj.注意的，专心的；关心(别人)的，殷勤的

参考例句：

• She was very attentive to her guests.她对客人招待得十分周到。
• The speaker likes to have an attentive audience.演讲者喜欢注意力集中的听众。

2 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。

3 exhausted   

adj.极其疲惫的，精疲力尽的

参考例句：

• It was a long haul home and we arrived exhausted.搬运回家的这段路程特别长，到家时我们已筋疲力尽。
• Jenny was exhausted by the hustle of city life.珍妮被城市生活的忙乱弄得筋疲力尽。

4 dens   

n.牙齿，齿状部分；兽窝( den的名词复数 )；窝点；休息室；书斋

参考例句：

• Female bears tend to line their dens with leaves or grass. 母熊往往会在洞穴里垫些树叶或草。 来自辞典例句
• In winter bears usually hibernate in their dens. 冬天熊通常在穴里冬眠。 来自辞典例句