单词：species population
单词：species population 相关文章
Passage 48 Population Growth It is well-known that there has been a drastic increase in world population. But it is probably less well-known that the extinction rate of wildlife species is experiencing a parallel trend. Take the United States for in
英语专业四级听写
Australia Size: 7,686,848 sq. km Population: Over 18 million Currency: Australia dollar Main language: English National Anthem: Advance Australia Fair National Flag: Australia lies 1500 km north-west
知性英语
Irrawaddy Dolphin Numbers Increase on Mekong River The number of Irrawaddy dolphins in one part of the Mekong River has increased for the first time tin 20 years. The dolphins, however, still face serious threats to their survival. They are considere
2018年VOA慢速英语(四)月
Population Growth It is well-known that there has been a drastic increase in world population. But it is probably less well-known that the extinction rate of wildlife species is experiencing a parallel trend. Take the United States for instance. In 1
英语专业四级听力50篇
美国帮助拯救西非濒危大猩猩 The U.S. is helping to save an elusive and endangered species of gorilla in West Africa. The Fish and Wildlife Service and the Wildlife Conservation Society have developed a five-year plan to ensure the surviva
VOA双语新闻 2012年3月
Transcript (by myconsent) --for reference only Climate change is normally bad news for endangered species, but in the case of Australia s Grey Nurse Shark, some scientists suggest it might actually help their fight for survival. The Grey Nurse Shark
国家地理2008年
A species of frog has been found alive on a farm in Australia more than 30 years after it was thought to have become extinct. Environment officials have said a thriving population of yellow-spotted bell frogs has been found in a remote creek in New S
VOA标准英语2010年(三月)
The US announced on Wednesday that it will support a ban on the international trade of Atlantic bluefin tuna. The announcement comes prior to this month's meeting in Qatar of the Convention on International Trade in Endangered Species of Wildlife Fau
VOA标准英语2010年(三月)
AS IT IS 2015-03-16 Fighting for Lions in Zimbabwe 在津巴布韦为更好的保护狮子而努力 Conservationists are breeding lions in the Southern African nation of Zimbabwe. The wildlife experts hope to increase the lion population to keep the
2015年VOA慢速英语(三)月
Saving the Cross River Gorilla The U.S. is helping to save an elusive and endangered species of gorilla in West Africa. The Fish and Wildlife Service and the Wildlife Conservation Society have developed a five-year plan to ensure the survival of the
VOA标准英语2012年(三月)
New technologies aid in conservation efforts at the National Zoo Susan Logue Koster | Front Royal, Virginia 19 July 2010 The National Zoo opened a cheetah science facility in 2007 at its conservation center in Front Royal, VA. Cheetahs are considered
VOA标准英语2010年(七)月
US Woman Fights to Save Cheetahs Since ancient times, people have regarded cheetahs with awe for their beauty, grace and unique ability to reach speeds of up to 110 kilometers per hour. But today, the species - which once ranged across Africa, India
VOA标准英语2011年(六月)
And in doing so, we were breeding them for parasitism. 为了做到这点，人类用喂养的方式来让它们寄生于我们。 We were giving them all sorts of reasons to adapt new ways. 我们给了动物们适应新环境的各种理由。 So,
TED演讲娱乐篇
The tiny northern corroboree frog of Australia is only just hanging on. Populations of both the northern and southern corroboree frogs have declined catastrophically in the wild over the last two decades. The primary culprit is the deadly chytrid fun
自然百科2009年
Climate change is normally bad news for endangered species, but in the case of Australias Grey Nurse Shark, some scientists suggest it might actually help their fight for survival. The Grey Nurse Shark is one of Australias most critically endangered
自然百科2008年
Butterfly Shows Speciation Sign A study in the journal Science looks at Heliconius butterflies in Ecuador, in which a single gene change that influences mate choice may be the first step in the splitting of the population into two species. Cynthia Gr
60秒科学
The giant panda is no longer an endangered species, following decades of work by conservationists to save it. 经过动物保护工作者几十年的努力，大熊猫不再是濒危物种了。 The official status of the much-loved animal has been c
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The old adage that there are lies, damned lies, and statistics is, funnily enough, rather hard to find an original source for. 俗语有云：世上有三种谎言：谎言，该死的谎言，以及统计数据。但有趣的是，很难找到这句话
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Hawaiian monk seal births are on the rise, according to The Marine Mammal Center. 据海洋哺乳动物中心称，僧海豹出生率在上升。 The species is considered critically endangered, with fewer than 1,200 individuals left in the wild. Sci
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We also then went to look at what are these molecules -- these were the red triangles on my slides before. 我们同时也研究了这些小分子，这些就是我刚才幻灯上的小红三角形。 And so this is the Vibrio fischeri molecule. This
TED演讲教育篇