英语听力：探索发现 2012-09-23 长毛象王国 Mammoth—7

 Bears have long claws, but they get worn down by the daily grind, moving around and rooting for food. They are just not sharp enough to rip into the bison’s hide.

 

To solve this puzzle, we need to look to Africa. African buffalo¹ are similar in size to the extinct steppe bison. So what is their foremost predator²? The lion. Lions, unlike bears, have their claws sheathed³ most of the time to keep them razor-sharp. But when they strike, their claws extend to get a good grip on the victim’s hide. This often leaves deep gouges⁴, just like those found on the mummified bison. 

 

And there’s a second clue. The most efficient way to kill large prey⁵ is suffocation⁶. Lions typically clamp their jaws⁷ around the victims muzzle⁸ in a deadly bite. Our Ice Age bison had a set of puncture⁹ marks on its snout, around 9 centimeters apart, the blueprint¹⁰ of lion’s bite. 

 

The third and final clue was found embedded¹¹ in the bison’s hide, a tiny fragment of lion tooth. 

 

So it seems the king of the savannah once roamed the cold expanses of Ice Age America. These long-lost lions of Beringia were close relatives of those we find in Africa today, but they were up to 25% bigger, amongst the largest lions that ever walked the earth. 

 

Thanks to the bison herds¹² and other big game, they could flourish in the freezing north. But the lion’s family tree begins in Africa. So how do they end up here?

1 buffalo   

n.(北美)野牛；(亚洲)水牛

参考例句：

• Asian buffalo isn't as wild as that of America's. 亚洲水牛比美洲水牛温顺些。
• The boots are made of buffalo hide. 这双靴子是由水牛皮制成的。

2 predator   

n.捕食其它动物的动物；捕食者

参考例句：

• The final part of this chapter was devoted to a brief summary of predator species.本章最后部分简要总结了食肉动物。
• Komodo dragon is the largest living lizard and a fearsome predator.科摩多龙是目前存在的最大蜥蜴，它是一种令人恐惧的捕食性动物。

3 sheathed   

adj.雕塑像下半身包在鞘中的；覆盖的；铠装的；装鞘了的v.将（刀、剑等）插入鞘( sheathe的过去式和过去分词 )；包，覆盖

参考例句：

• Bulletproof cars sheathed in armour. 防弹车护有装甲。 来自《简明英汉词典》
• The effect of his mediation was so great that both parties sheathed the sword at once. 他的调停非常有效，双方立刻停战。 来自《现代汉英综合大词典》

4 gouges   

n.凿( gouge的名词复数 )；乱要价；（在…中）抠出…；挖出…v.凿( gouge的第三人称单数 )；乱要价；（在…中）抠出…；挖出…

参考例句：

• Clegg and Rollins indicate that nonwrinkleresistant cotton fibers often exhibIt'surface gouges and fibrillation. 克莱格和罗林斯指出，未经防皱处理的棉纤维表面，通常有凿槽和微纤化现象发生。 来自辞典例句
• She didn't mind that we banged into the walls and put gouges in the door jambs. 她一点也不介意我们撞坏墙或是把门框碰出小坑来。 来自互联网

5 prey   

n.被掠食者，牺牲者，掠食；v.捕食，掠夺，折磨

参考例句：

• Stronger animals prey on weaker ones.弱肉强食。
• The lion was hunting for its prey.狮子在寻找猎物。

6 suffocation   

n.窒息

参考例句：

• The greatest dangers of pyroclastic avalanches are probably heat and suffocation. 火成碎屑崩落的最大危害可能是炽热和窒息作用。 来自辞典例句
• The room was hot to suffocation. 房间热得闷人。 来自辞典例句

7 jaws   

n.口部；嘴

参考例句：

• The antelope could not escape the crocodile's gaping jaws. 那只羚羊无法从鱷鱼张开的大口中逃脱。
• The scored jaws of a vise help it bite the work. 台钳上有刻痕的虎钳牙帮助它紧咬住工件。

8 muzzle   

n.鼻口部；口套；枪(炮)口；vt.使缄默

参考例句：

• He placed the muzzle of the pistol between his teeth.他把手枪的枪口放在牙齿中间。
• The President wanted to muzzle the press.总统企图遏制新闻自由。

9 puncture   

n.刺孔，穿孔；v.刺穿，刺破

参考例句：

• Failure did not puncture my confidence.失败并没有挫伤我的信心。
• My bicycle had a puncture and needed patching up.我的自行车胎扎了个洞，需要修补。

10 blueprint   

n.蓝图，设计图，计划；vt.制成蓝图，计划

参考例句：

• All the machine parts on a blueprint must answer each other.设计图上所有的机器部件都应互相配合。
• The documents contain a blueprint for a nuclear device.文件内附有一张核装置的设计蓝图。

11 embedded   

a.扎牢的

参考例句：

• an operation to remove glass that was embedded in his leg 取出扎入他腿部玻璃的手术
• He has embedded his name in the minds of millions of people. 他的名字铭刻在数百万人民心中。

12 herds   

兽群( herd的名词复数 )； 牧群； 人群； 群众

参考例句：

• Regularly at daybreak they drive their herds to the pasture. 每天天一亮他们就把牲畜赶到草场上去。
• There we saw herds of cows grazing on the pasture. 我们在那里看到一群群的牛在草地上吃草。