英语听力：自然百科 大迁徙之繁衍生息 Need to Breed—7

 But they can't migrate to greener pastures until the last of the youngsters has been winged. So mother has become stingy and edgy¹. 

 

Readying for the migration² ahead, she tongues oily secretions³ over every bit of her flight equipment. A bat's wings are essentially⁴ enormous webbed hands. Elongated⁵ finger bones providing the struts⁶ to unfold and manipulate the flight membranes⁷. 

 

As dusk settles, the migration begins. For little bats, wings spreading three feet tip to tip,blacken the skies with their departure.

 

Tonight, they have to travel many miles with their newly winged young. And inexperience on the wing will prove deadly.  

 

Parenting is risky⁸ business. Migrants around the world will risk everything for the next generation. But before you can breed, you must earn the right. And in Africa, one species readies for battle

1 edgy   

adj.不安的；易怒的

参考例句：

• She's been a bit edgy lately,waiting for the exam results.她正在等待考试结果，所以最近有些焦躁不安。
• He was nervous and edgy, still chain-smoking.他紧张不安，还在一根接一根地抽着烟。

2 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。

3 secretions   

n.分泌（物）( secretion的名词复数 )

参考例句：

• Lysozyme is an enzyme found in egg white, tears, and other secretions. 溶菌酶是存在于卵白、泪和其他分泌物中的一种酶。 来自辞典例句
• Chest percussion and vibration are used with postural drainage to help dislodge secretions. 在做体位引流时要敲击和振动胸部帮助分泌物松动排出。 来自辞典例句

4 essentially   

adv.本质上，实质上，基本上

参考例句：

• Really great men are essentially modest.真正的伟人大都很谦虚。
• She is an essentially selfish person.她本质上是个自私自利的人。

5 elongated   

v.延长，加长( elongate的过去式和过去分词 )

参考例句：

• Modigliani's women have strangely elongated faces. 莫迪里阿尼画中的妇女都长着奇长无比的脸。
• A piece of rubber can be elongated by streching. 一块橡皮可以拉长。 来自《用法词典》

6 struts   

（框架的）支杆( strut的名词复数 )； 支柱； 趾高气扬的步态； （尤指跳舞或表演时）卖弄

参考例句：

• The struts are firmly braced. 那些支柱上得很牢靠。
• The Struts + EJB framework is described in part four. 三、介绍Struts+EJB框架的技术组成：Struts框架和EJB组件技术。

7 membranes   

n.（动物或植物体内的）薄膜( membrane的名词复数 )；隔膜；（可起防水、防风等作用的）膜状物

参考例句：

• The waste material is placed in cells with permeable membranes. 废液置于有渗透膜的槽中。 来自辞典例句
• The sarcoplasmic reticulum is a system of intracellular membranes. 肌浆网属于细胞内膜系统。 来自辞典例句

8 risky   

adj.有风险的，冒险的

参考例句：

• It may be risky but we will chance it anyhow.这可能有危险，但我们无论如何要冒一冒险。
• He is well aware how risky this investment is.他心里对这项投资的风险十分清楚。