久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

BBC Learning English 英語教學

Huge canyon under the Antarctica? 南極冰層下可能發現巨大峽谷

?

Huge canyon under the Antarctica? 南極冰層下可能發現巨大峽谷

在南極冰層下可能藏著一個尚未被證實的巨大峽谷。科學家們正在進行多種試驗以進一步核實捕集到的數據,他們計劃在 2016 年晚些時候公布試驗的結果。科學家希望這些試驗能幫他們了解冰層對未來氣候變化的反應。以下是 Jonathan Amos 的報道。

For more than five decades scientists have been trying to draw an accurate map of what lies under the Antarctic ice sheet, which is more than 2.5 miles thick in places. Only a couple of regions remain unexplored, what the experts refer to as the 'Poles of Ignorance'.

One of these is a vast expanse in the east of the continent known as Princess Elizabeth Land. It's now the target of intense study and satellites have detected subtle shapes in the ice surface that suggest there could be a network of canyons hiding down below. If correct, the system would be more than 600 miles long and over 0.5 mile deep. There may be a buried lake as well.

Stewart Jamieson from Durham University led the research: "Knowing what lies beneath the ice sheet is important because we know that the shape of the landscape determines how the ice flows and responds over time. And so we'll be better able to predict how the ice sheet will respond to climate change in the future."

Airplanes are currently flying over Princess Elizabeth Land with sensors that can accurately survey the shape of the rock bed. They should confirm the presence of the canyon system.

詞匯表

accurate 精確的,準確的
unexplored 未勘探的,未探索的
expanse 廣闊的區域
satellites 衛星
subtle 不明顯的,不易察覺的
determines 決定,形成,影響
sensors 傳感器

測驗

請聽報道并回答下列問題。

1. How much of Antarctica is known to scientists?

2. What made scientists think there might be a network of canyons under the surface?

3. Why could the existence of canyons help scientists predict what will happen to the ice sheet?

4. How do sensors find out if there is a canyon beneath the surface?

答案

1. How much or Antarctica is known to scientists?
All of it apart from two regions they call 'Poles of Ignorance'.

2. What made scientists think there might be a network of canyons under the surface?
Satellites have detected subtle shapes in the ice surface suggesting the existence of canyons.

3. Why could the existence of canyons help scientists predict what will happen to the ice sheet? The shape of the landscape determines how the ice flows and responds overtime.

4. How do sensors help find out if there is a canyon beneath the surface?
They survey the shape of the rock bed.

關注和訂閱

人氣排行
熱搜詞
 
 
精華欄目
 
Copyright ©
主站蜘蛛池模板: 美国一级特a黄 | 久久免费视频7 | 日产一区2区三区有限公司 日产一区两区三区 | 九九精品激情在线视频 | 美女一级毛片免费看看 | 综合视频在线 | 色一欲一性一乱一区二区三区 | 久香草视频在线观看 | 九九精品视频在线 | 欧美日韩亚洲国产精品 | 在线播放一区二区精品产 | 成人a毛片手机免费播放 | 国产高清视频在线播放 | 久久精品国产免费高清 | 中文字幕一区二区三区免费视频 | 亚洲欧洲国产成人精品 | 亚洲精品国产一区二区在线 | 欧美色黄毛片 | 精品国产香港三级 | 99视频九九精品视频在线观看 | 台湾三级 | 中文字幕一区2区 | a毛片免费观看完整 | 亚洲久久视频 | 一级毛片成人午夜 | 看一级特黄a大片日本片 | 久久公开视频 | 一级毛片aaaaaa免费看 | 日本高清视频一区二区 | 97久草 | 美女视频黄色免费 | 欧美韩国日本一区 | 日韩一区二区中文字幕 | 窝窝社区在线观看www | 4455四色永久免费 | 97影院理伦在线观看 | 免费人成观看在线网 | 欧美日韩国产高清一区二区三区 | 在线永久免费观看黄网站 | 国产欧美视频一区二区三区 | 久久精品网站免费观看调教 |