英语听力：2013-04-21 恐龙之战之极限生存 Extreme Survivors—15

 But with both parents out searching for food,

 

the nest is left unguarded and exposed.

 

Triceratops may be a plant eater, but with a defenseless baby T. Rex around, it'll make an exception. 

 

Quetzalcoatlus is the largest flying carnivore in Earth's history. It eats 4-5 kilos of flesh every day, nearly the weight of two hatchlings combined.

 

To survive, these chicks will have to keep a very low profile.

 

A Tyrannosaurus Rex can pinpoint¹ the exact location of an odor.

 

Soon he's headed straight for the dead Triceratops.

 

The sense of smell was powerful in the T. Rex.

 

The nerve that goes to the sense of smell

 

is the biggest nerve the dinosaur² had.

 

They could probably tell

 

not just if there was dinosaur that had walked past.

 

They could be able to tell

 

that that dinosaur walked past 2 and half hours ago.

 

T. Rex's nose, like a laser-guidance system, and leads him directly to his target.

 

But what these advanced senses do not tell him

 

is how his Triceratops died in the first place. The answer to that question

 

is found in the mouth of another T. Rex.

 

This predator's massive jaws³,

 

with their bone-crushing teeth

 

able to bite down with enough force to bend steel,

 

hold the hidden danger.

 

It's quite likely that the teeth of carnivorous dinosaurs⁴

 

have rotting meat, little bits of it, caught in their teeth, and therefore a lot of bacteria

 

and therefore an infectious bite.

 

The bacteria would have given T. Rex permanent bad breath.

 

There would be many reasons you would not want to be

 

around the mouth of a T. Rex,

 

and smell would have been one of them.

 

That bacteria means that any bite that draws blood

 

can cause a life-threatening infection.

1 pinpoint   

vt.准确地确定；用针标出…的精确位置

参考例句：

• It is difficult to pinpoint when water problems of the modern age began.很难准确地指出，现代用水的问题是什么时候出现的。
• I could pinpoint his precise location on a map.我能在地图上指明他的准确位置。

2 dinosaur   

n.恐龙

参考例句：

• Are you trying to tell me that David was attacked by a dinosaur?你是想要告诉我大卫被一支恐龙所攻击？
• He stared at the faithful miniature of the dinosaur.他凝视著精确的恐龙缩小模型。

3 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。

4 dinosaurs   

n.恐龙( dinosaur的名词复数 )；守旧落伍的人，过时落后的东西

参考例句：

• The brontosaurus was one of the largest of all dinosaurs. 雷龙是所有恐龙中最大的一种。 来自《简明英汉词典》
• Dinosaurs have been extinct for millions of years. 恐龙绝种已有几百万年了。 来自《简明英汉词典》