英语听力：自然百科 大迁徙 Great Migrations—7

 Then the brilliant masses take to the wing, heading to a place they've never been. Their only map, imprinted¹ on their genes². A mysterious interplay of sun on eyes and antennae³, an uncanny sense of magnetic north guides the way. 

 

It will take five months for three generations to get the species as far north as Canada and a fourth super-generation to get them back to Mexico. Such a multi-generational migration⁴ is incredibly rare. It takes the leading generation three weeks to fly 500 miles into the southern U.S..

 

These intrepid⁵ elders sense the deaths are approaching fast. There is urgency now to pass on the migratory⁶ baton⁷. The female, having carried her eggs from Mexico, now searches for the monarch’s life-giving grail. 

 

The milkweed sprouting⁸ all around, her offspring will be laid on it, hatch on it, nurse on its toxic⁹ milk and become toxic themselves, a defense¹⁰ they will flaunt¹¹ with their singular beauty. 

 

She is dying, but with luck, her children, grandchildren and great grandchildren will carry on the journey as far north as Canada and then an astounding¹² 2,000 miles back to Mexico.

1 imprinted   

v.盖印（imprint的过去式与过去分词形式）

参考例句：

• The terrible scenes were indelibly imprinted on his mind. 那些恐怖场面深深地铭刻在他的心中。
• The scene was imprinted on my mind. 那个场面铭刻在我的心中。 来自《简明英汉词典》

2 genes   

n.基因( gene的名词复数 )

参考例句：

• You have good genes from your parents, so you should live a long time. 你从父母那儿获得优良的基因，所以能够活得很长。 来自《简明英汉词典》
• Differences will help to reveal the functions of the genes. 它们间的差异将会帮助我们揭开基因多种功能。 来自英汉非文学 - 生命科学 - 生物技术的世纪

3 antennae   

n.天线；触角

参考例句：

• Sometimes a creature uses a pair of antennae to swim.有时某些动物使用其一对触须来游泳。
• Cuba's government said that Cubans found watching American television on clandestine antennae would face three years in jail.古巴政府说那些用秘密天线收看美国电视的古巴人将面临三年监禁。

4 migration   

n.迁移，移居，（鸟类等的）迁徙

参考例句：

• Swallows begin their migration south in autumn.燕子在秋季开始向南方迁移。
• He described the vernal migration of birds in detail.他详细地描述了鸟的春季移居。

5 intrepid   

adj.无畏的，刚毅的

参考例句：

• He is not really satisfied with his intrepid action.他没有真正满意他的无畏行动。
• John's intrepid personality made him a good choice for team leader.约翰勇敢的个性适合作领导工作。

6 migratory   

n.候鸟，迁移

参考例句：

• Many migratory birds visit this lake annually.许多候鸟每年到这个湖上作短期逗留。
• This does not negate the idea of migratory aptitude.这并没有否定迁移能力这一概念。

7 baton   

n.乐队用指挥杖

参考例句：

• With the baton the conductor was beating time.乐队指挥用指挥棒打拍子。
• The conductor waved his baton,and the band started up.指挥挥动指挥棒，乐队开始演奏起来。

8 sprouting   

v.发芽( sprout的现在分词 )；抽芽；出现；（使）涌现出

参考例句：

• new leaves sprouting from the trees 树上长出的新叶
• They were putting fresh earth around sprouting potato stalks. 他们在往绽出新芽的土豆秧周围培新土。 来自名作英译部分

9 toxic   

adj.有毒的，因中毒引起的

参考例句：

• The factory had accidentally released a quantity of toxic waste into the sea.这家工厂意外泄漏大量有毒废物到海中。
• There is a risk that toxic chemicals might be blasted into the atmosphere.爆炸后有毒化学物质可能会进入大气层。

10 defense   

n.防御，保卫；[pl.]防务工事；辩护，答辩

参考例句：

• The accused has the right to defense.被告人有权获得辩护。
• The war has impacted the area with military and defense workers.战争使那个地区挤满了军队和防御工程人员。

11 flaunt   

vt.夸耀，夸饰

参考例句：

• His behavior was an outrageous flaunt.他的行为是一种无耻的炫耀。
• Why would you flaunt that on a public forum?为什么你们会在公共论坛大肆炫耀？

12 astounding   

adj.使人震惊的vt.使震惊，使大吃一惊astound的现在分词)

参考例句：

• There was an astounding 20% increase in sales. 销售量惊人地增加了20%。
• The Chairman's remarks were so astounding that the audience listened to him with bated breath. 主席说的话令人吃惊，所以听众都屏息听他说。 来自《简明英汉词典》