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VOA慢速英语2016--地下王国:卡尔斯巴德洞窟国家公园

时间:2016-05-31 23:03来源:互联网 提供网友:nan   字体: [ ]
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An Underground World: Carlsbad Caverns2 National Park 地下王国:卡尔斯巴德洞窟国家公园

This week, we explore a national park -- and UNESCO World Heritage Site -- in the American Southwest.

This national park, near the city of Carlsbad, New Mexico, is unusual in a major way --- it is mostly underground.

Carlsbad Caverns National Park contains more than 100 caves below the surface of the desert. Most are closed to the public. But anyone can visit the main attraction, one of the largest caves in the world.

Huge. Incredible. Inspiring. Words like these come to mind as visitors enter a world of silence, darkness and cold, almost 230 meters under the ground.

An elevator lowers you into the world of Carlsbad Cavern1. It is silent, except for the quiet voices of guides and visitors. It is not fully3 dark though. The National Park Service has enough lighting4 to see many of the beautiful formations all around. The temperature in the cave is about 13 degrees Celsius5.

A cavern is a large cave. But Carlsbad Cavern is really a long series of chambers7. One of these is called the Big Room. The Big Room measures more than three hectares. The ceiling is 77 meters high. The Big Room is the single largest underground chamber6 ever found in North America.

The Big Room and other parts of the cavern contain huge, sharp formations of minerals. People are free to explore the lit formations in the Big Room. But park rangers9 must guide visitors to other areas of the cave.

Stalactites hang from the ceiling. Stalagmites rise from the floor. Some even meet to create a column. Other formations look like needles, popcorn10, pearls and flowers.

One of the first questions visitors might have is how did Carlsbad Cavern form? Guides explain that it did not result from the action of waterways like other limestone11 caves. Its creator was sulfuric acid.

The limestone developed about 250 million years ago. Then, within the last 20 million years, movements in the earth pushed the rock upward, forming the Guadalupe Mountains. Today these mountains extend from west Texas into southeast New Mexico.

The action of oil and natural gas created hydrogen sulfide in the limestone. The hydrogen sulfide reacted with oxygen in rainwater moving through the rock. Sulfuric acid developed. The acid created the caves by dissolving the limestone in its path.

Later, the water and most of the acid left the caves as the Guadalupe Mountains continued to rise. This permitted freshwater to move through. The freshwater left behind minerals. These minerals became the formations and shapes on the ceilings, walls and floors of the caves.

People are not the only visitors to Carlsbad Caverns National Park. About 400,000 Mexican free-tailed bats come from Mexico every summer to give birth in the big cave.

As the sun goes down each day, thousands of adult bats fly out of the cave. It can take from 20 minutes to more than two hours for them all to leave. They go to nearby river valleys to feed on insects. Then, toward morning, they return to the bat cave within Carlsbad Cavern.

Park Service rangers explain that mother bats find their babies by remembering their location, their smell and the sound of their cry. Mothers and their babies, called pups, hang in groups on the ceiling. They spend the day resting and feeding.

While the adults go out at night for food, the young bats hang out in the cave for four or five weeks. Then, in July or August, they join their mothers on these nightly flights.

Finally, in late October or early November, the bats all leave and return to Mexico. But they always come back the next year.

It is possible that it was the bats that led ancient people to discover the cave. Archaeologists and others have found evidence of Ice Age hunters near the cave entrance. They have also found pieces of spear points left about 10,000 years ago.

More recently, Apache Indians painted pictures at the entrance. And evidence of one of their cooking areas was found beside a nearby path.

Around 1900, a teenage cowboy named James Larkin White began to explore the cave. Jim White told his story in the 1932 book, "The Discovery and History of Carlsbad Caverns." Here is a reading of his description of his first sight of the bats and the big cave:

"I thought it was a volcano, but then, I’d never seen a volcano -- nor never before had I seen bats swarm12, for that matter. During my life on the range I’d seen plenty of prairie whirlwinds -- but this thing didn’t move; it remained in one spot, spinning its way upward. I watched it for perhaps a half-hour -- until my curiosity got the better of me. Then I began investigating …"

Jim White told how he built a ladder from rope, wire and sticks and returned to the entrance of the cave a few days later.

"Standing13 at the entrance of the tunnel I could see ahead of me a darkness so absolutely black it seemed a solid. The light of my lantern was but a sickly glow. Nevertheless, I forged ahead, and with each step the tunnel grew larger, and I felt as though I was wandering into the very core of the Guadalupe Mountains."

Several years later, in 1918, Jim White took a professional photographer into the cave. Ray Davis' pictures of the Big Room appeared in the New York Times newspaper. National interest began to grow.

In 1923, scientists from the National Geographic14 Society explored the caves. The following year, President Calvin Coolidge named Carlsbad a national monument. Presidents can declare national monuments, but Congress must act to establish a national park. And that is what Congress did in 1930.

Since then, parts of Carlsbad Caverns have been used for movie sets, weddings, even meetings of the Carlsbad City Council.

Most visitors go to the main cavern. But some experienced cavers are permitted to explore five "wild" caves in the park. And, in another one, scientists are studying microbes in search of a cure for cancer.

As for Jim White, he became chief ranger8 of Carlsbad Caverns. In one story in his book, he talks about all the work that was done in the area.

"I doubt if you can understand how happy this modernizing15 has made me. It's like the pleasant end to a dream."

Words in This Story

attraction - n. something interesting or enjoyable that people want to visit, see, or do?

incredible - adj. extremely good, great, or large

inspiring - adj. causing people to want to do or create something or to lead better lives

elevator - n. a machine used for carrying people and things to different levels

chamber - n. a small space inside something

swarm - v. to move in a large group

prairie - n. a large, mostly flat area of land in North America that has few trees and is covered in grasses

whirlwind - n. a very strong wind that moves in a spinning or swirling16 motion and that can damage buildings, trees, etc.

range - n. open land that farm animals (such as cows and sheep) use for feeding and roaming


点击收听单词发音收听单词发音  

1 cavern Ec2yO     
n.洞穴,大山洞
参考例句:
  • The cavern walls echoed his cries.大山洞的四壁回响着他的喊声。
  • It suddenly began to shower,and we took refuge in the cavern.天突然下起雨来,我们在一个山洞里避雨。
2 caverns bb7d69794ba96943881f7baad3003450     
大山洞,大洞穴( cavern的名词复数 )
参考例句:
  • Within were dark caverns; what was inside them, no one could see. 里面是一个黑洞,这里面有什么东西,谁也望不见。 来自汉英文学 - 家(1-26) - 家(1-26)
  • UNDERGROUND Under water grottos, caverns Filled with apes That eat figs. 在水帘洞里,挤满了猿争吃无花果。
3 fully Gfuzd     
adv.完全地,全部地,彻底地;充分地
参考例句:
  • The doctor asked me to breathe in,then to breathe out fully.医生让我先吸气,然后全部呼出。
  • They soon became fully integrated into the local community.他们很快就完全融入了当地人的圈子。
4 lighting CpszPL     
n.照明,光线的明暗,舞台灯光
参考例句:
  • The gas lamp gradually lost ground to electric lighting.煤气灯逐渐为电灯所代替。
  • The lighting in that restaurant is soft and romantic.那个餐馆照明柔和而且浪漫。
5 Celsius AXRzl     
adj.摄氏温度计的,摄氏的
参考例句:
  • The temperature tonight will fall to seven degrees Celsius.今晚气温将下降到七摄氏度。
  • The maximum temperature in July may be 36 degrees Celsius.七月份最高温度可能达到36摄氏度。
6 chamber wnky9     
n.房间,寝室;会议厅;议院;会所
参考例句:
  • For many,the dentist's surgery remains a torture chamber.对许多人来说,牙医的治疗室一直是间受刑室。
  • The chamber was ablaze with light.会议厅里灯火辉煌。
7 chambers c053984cd45eab1984d2c4776373c4fe     
n.房间( chamber的名词复数 );(议会的)议院;卧室;会议厅
参考例句:
  • The body will be removed into one of the cold storage chambers. 尸体将被移到一个冷冻间里。 来自《简明英汉词典》
  • Mr Chambers's readable book concentrates on the middle passage: the time Ransome spent in Russia. Chambers先生的这本值得一看的书重点在中间:Ransome在俄国的那几年。 来自互联网
8 ranger RTvxb     
n.国家公园管理员,护林员;骑兵巡逻队员
参考例句:
  • He was the head ranger of the national park.他曾是国家公园的首席看守员。
  • He loved working as a ranger.他喜欢做护林人。
9 rangers f306109e6f069bca5191deb9b03359e2     
护林者( ranger的名词复数 ); 突击队员
参考例句:
  • Do you know where the Rangers Stadium is? 你知道Rangers体育场在哪吗? 来自超越目标英语 第3册
  • Now I'm a Rangers' fan, so I like to be near the stadium. 现在我是Rangers的爱好者,所以我想离体育场近一点。 来自超越目标英语 第3册
10 popcorn 8lUzJI     
n.爆米花
参考例句:
  • I like to eat popcorn when I am watching TV play at home.当我在家观看电视剧时,喜欢吃爆米花。
  • He still stood behind his cash register stuffing his mouth with popcorn.他仍站在收银机后,嘴里塞满了爆米花。
11 limestone w3XyJ     
n.石灰石
参考例句:
  • Limestone is often used in building construction.石灰岩常用于建筑。
  • Cement is made from limestone.水泥是由石灰石制成的。
12 swarm dqlyj     
n.(昆虫)等一大群;vi.成群飞舞;蜂拥而入
参考例句:
  • There is a swarm of bees in the tree.这树上有一窝蜜蜂。
  • A swarm of ants are moving busily.一群蚂蚁正在忙碌地搬家。
13 standing 2hCzgo     
n.持续,地位;adj.永久的,不动的,直立的,不流动的
参考例句:
  • After the earthquake only a few houses were left standing.地震过后只有几幢房屋还立着。
  • They're standing out against any change in the law.他们坚决反对对法律做任何修改。
14 geographic tgsxb     
adj.地理学的,地理的
参考例句:
  • The city's success owes much to its geographic position. 这座城市的成功很大程度上归功于它的地理位置。 来自《简明英汉词典》
  • Environmental problems pay no heed to these geographic lines. 环境问题并不理会这些地理界限。 来自英汉非文学 - 环境法 - 环境法
15 modernizing 44bdb80e6ee4cb51b9829f1073fceee0     
使现代化,使适应现代需要( modernize的现在分词 ); 现代化,使用现代方法
参考例句:
  • Modernizing a business to increase its profitability and competitiveness is a complicated affair. 使企业现代化,从而达到增加利润,增强竞争力的目的,是一件复杂的事情。
  • The young engineer had a large share in modernizing the factory. 这位年轻工程师在工厂现代化的过程中尽了很大的“力”。
16 swirling Ngazzr     
v.旋转,打旋( swirl的现在分词 )
参考例句:
  • Snowflakes were swirling in the air. 天空飘洒着雪花。 来自《现代汉英综合大词典》
  • She smiled, swirling the wine in her glass. 她微笑着,旋动着杯子里的葡萄酒。 来自辞典例句
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