英语听力：探索发现 2012-11-16 美洲大平原 American Serengeti—9

 Bison calves¹ are born in summer and can run within a few hours of their birth. They have no choice. The herd² won't wait in its eternal quest to find new grazing.  

 

Smaller grazers are still found here, too.  But they stay put instead of wandering the plains. Prairie dogs inhabit rambling³ subterranean⁴ towns that stretch tens of square miles. These highly social creatures stay within a short dash of their door, ready to retreat from predators⁵ or by weather.  It’s always maintenance work to do, but major renovations have to wait until after rain when the soil is soft.  All this working and re-working helps the land recover from the impact of so many bigger feet and appetites. 

 

At summer's end, male bison help to move the sun-baked soil as the rutting season starts. They roll in dust and paw the ground to try to dominate their rivals. The dust bath also helps to dislodge irritating insects. 

 

A prairie dog colony is usually surrounded by short, nutritious⁶ grass, thanks to the many teeth and toe. This constant grazing stimulates⁷ fresh growth and also keeps the field of vision clear for spotting predators. Larger neighbours are attracted to these burgeoning⁸ meadows, just as they were 13,000 years ago.

1 calves   

n.(calf的复数)笨拙的男子，腓；腿肚子( calf的名词复数 )；牛犊；腓；小腿肚v.生小牛( calve的第三人称单数 )；（冰川）崩解；生（小牛等），产（犊）；使（冰川）崩解

参考例句：

• a cow suckling her calves 给小牛吃奶的母牛
• The calves are grazed intensively during their first season. 小牛在生长的第一季里集中喂养。 来自《简明英汉词典》

2 herd   

n.兽群，牧群；vt.使集中，把…赶在一起

参考例句：

• She drove the herd of cattle through the wilderness.她赶着牛群穿过荒野。
• He had no opinions of his own but simply follow the herd.他从无主见，只是人云亦云。

3 rambling   

adj.[建]凌乱的，杂乱的

参考例句：

• We spent the summer rambling in Ireland. 我们花了一个夏天漫游爱尔兰。
• It was easy to get lost in the rambling house. 在布局凌乱的大房子里容易迷路。

4 subterranean   

adj.地下的，地表下的

参考例句：

• London has 9 miles of such subterranean passages.伦敦像这样的地下通道有9英里长。
• We wandered through subterranean passages.我们漫游地下通道。

5 predators   

n.食肉动物( predator的名词复数 )；奴役他人者（尤指在财务或性关系方面）

参考例句：

• birds and their earthbound predators 鸟和地面上捕食它们的动物
• The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》

6 nutritious   

adj.有营养的，营养价值高的

参考例句：

• Fresh vegetables are very nutritious.新鲜蔬菜富于营养。
• Hummingbirds have discovered that nectar and pollen are very nutritious.蜂鸟发现花蜜和花粉是很有营养的。

7 stimulates   

v.刺激( stimulate的第三人称单数 )；激励；使兴奋；起兴奋作用，起刺激作用，起促进作用

参考例句：

• Exercise stimulates the body. 运动促进身体健康。 来自《简明英汉词典》
• Alcohol stimulates the action of the heart. 酒刺激心脏的活动。 来自《现代英汉综合大词典》

8 burgeoning   

adj.迅速成长的，迅速发展的v.发芽，抽枝( burgeon的现在分词 )；迅速发展；发（芽），抽（枝）

参考例句：

• Our company's business is burgeoning now. 我们公司的业务现在发展很迅速。 来自《简明英汉词典》
• These efforts were insufficient to contain the burgeoning crisis. 这些努力不足以抑制迅速扩散的危机。 来自辞典例句