标签：limestone 相关文章
By piecing together the evidence these creatures left behind, we can build a picture of this sub-tropical corner of the continent as it was 13,000 years ago. While most of North America was still in the grip of the Big Freeze, Florida was an ice age
探索与发现2012年
The sight of Roscoe Janneys car made Henrys pulse beat faster. Roscoe owned a big old Jeep. Do you go camping? he asked Roscoe. He still didnt trust the guy, but he admired that cool car. I used to, Roscoe replied. The Jeep is great over these mounta
63 The Mystery at Peacock Hall
Spring has just sprung in the Northern Hemisphere, and that means an annual natural spectacular is just a couple of weeks away, deep in the heart of Texas. 春天已经来到了北半球，这也意味着在德克萨斯州的中心地区，一年一度
VOA双语新闻 2011年3月
A king size conundrum ruins ruined, twins who were both first. That's all coming up this Thursday edition of CNN Student News. We start with the thread of the severe weather. The tropical cyclone, which is the same kind of storm as hurricane. And the
CNN2013年(五)月
New Concrete Recipes Could Cut Cracks能够对抗公路裂化的新型混凝土配方 There's a stretch of highway in Pennsylvania, along U.S. 422. And like every probably 20 feet you see a big pothole or cracking at the joint. Like everywhere. It wa
2017年科学美国人(五)月
This triggered other dramatic changes. As sea levels dropped, so did the inland water tables. Florida's fresh water drained away through the porous limestone rock. Pools dried up and springs diminished. Florida was on the brink of drought. And animal
探索与发现2013年
It is early evening and soon this amphitheater will be standing room only for the evening show. Bats, hundreds of thousands of Mexican Free-tailed bats, are hungry tornado that swirls out of New Mexico's Carlsbad Caverns each night in search of food.
国家地理2007年
By Katherine Cole Washington 30 May 2007 For close to 50 years, mandolinist and composer David Grisman has been one of America's leading proponents of acoustic music in America. In that time, he's recorded dozens of albums of his own music, and produ
2007年VOA标准英语（五月）
By Liu Enming Washington, DC 27 February 2007 watch MLK Sculptor report A master sculptor was recently selected to carve the image of Martin Luther King, Jr. for a memorial to the slain civil rights leader in Washington DC. VOA's Elaine Lu introduces
2007年VOA标准英语（二月）
This is the VOA Special English Agriculture Report. For some people, the road to immediate satisfaction is laid with sod. A piece of sod has grass on the top and soil on the bottom. It can provide thick green grass without the work or wait required
VOA慢速英语2009年（七）月
By Anjana Pasricha New Delhi 22 September 2007 A political storm is raging over a project to build a shipping canal in southern India. As Anjana Pasricha reports from New Delhi, Hindu activists say the canal will destroy a bridge they believe was bui
2007年VOA标准英语（九月）
Spring has just sprung in the Northern Hemisphere, and that means an annual natural spectacular is just a couple of weeks away, deep in the heart of Texas. There are no other natural wonders in the rugged Texas Hill Country. No awe-inspiring canyons,
VOA标准英语2011年(三月)
Species Split When Mountains Rise生脉隆起导致生物多样化 The tropics are well known for their biodiversity. But another hotspot? Mountains. Like the Hengduan Mountains, in south-central China. 热带地区因为其生物多样性而为大家所
2017年Scientific American(四)月
Where every plant and animal helps sustain the whole.The waste from parrot fish cements the reef. Stinging anemones provide a haven to the vulnerable. Even killers play their part, preventing a population explosion that would destroy this fragile eco
自然百科2011年
As a polyp grows, it puts up a wall of limestone around itself. And then it multiplies. Each polyp can produce thousands of offspring, which all work together to build a living fortress-- a coral reef. After just a few years, a single piece of coral
自然百科2011年
By Cathy Majtenyi Nairobi 07 November 2006 Kenyan Environment Minister Kivutha Kibwana opens talks at UN Climate Change Conference in Nairobi, November 6, 2006 Experts at the United Nations' Climate Change conference in Kenya's capital have warned T
2006年VOA标准英语（十一月)
By Sabina Castelfranco Rome 02 August 2007 Italy's culture minister is calling an accord reached with the J. Paul Getty Museum for the return of 40 ancient artifacts historic and a victory for artistic ethics. Sabina Castelfranco reports from Rome t
2007年VOA标准英语（八月）
An excitable conchologist would surely have fainted dead away before other, more numerous glass cases in which were classified specimens from the mollusk branch. 一位神经稍微锐敏一点的贝壳类专家，到了另一些陈列软体类动物标
《海底两万里》中英双语有声读物
Where Does The Term'Limelight'Originate You're in the limelight now on this moment of science. If someone loves being in the limelight, that means they enjoy being the center of attention. We use the word now to mean social prominence, but have you e
英语听力文摘 English Digest