英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—19

 Finally she leaves him some scraps¹ to chew on. A young male arrives, a dangerous situation for the cub². She growls³ a warning. It’s not enough. The cub slips. The mother must get her cub away from danger as quickly as possible.

They head north. She knows that this is where the ice, and with it the seals will first return.

It’s now September, but the sea might not freeze again for another two months. Her cub is unlikely to survive that long.

But there is hope on the horizon. An ice-rainbow heralds⁴ change. In the far north, temperatures drop at last. And ice sheets start to grow rather than disappear.

Then a miracle happens, building pressure combines with powerful southerly currents to push the drift-ice southwards.

 

1 scraps   

油渣

参考例句：

• Don't litter up the floor with scraps of paper. 不要在地板上乱扔纸屑。
• A patchwork quilt is a good way of using up scraps of material. 做杂拼花布棉被是利用零碎布料的好办法。

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 growls   

v.（动物）发狺狺声， （雷）作隆隆声( growl的第三人称单数 )；低声咆哮着说

参考例句：

• The dog growls at me. 狗向我狂吠。 来自《现代英汉综合大词典》
• The loudest growls have echoed around emerging markets and commodities. 熊嚎之声响彻新兴的市场与商品。 来自互联网

4 heralds   

n.使者( herald的名词复数 )；预报者；预兆；传令官v.预示( herald的第三人称单数 )；宣布（好或重要）

参考例句：

• The song of birds heralds the approach of spring. 百鸟齐鸣报春到。 来自《现代英汉综合大词典》
• The wind sweeping through the tower heralds a rising storm in the mountain. 山雨欲来风满楼。 来自《现代汉英综合大词典》