单词：species number
单词：species number 相关文章
VOICE ONE: This is SCIENCE IN THE NEWS in VOA Special English. I'm Steve Ember. VOICE TWO: And I'm Barbara Klein. This week, we will tell about cancer. Health experts say it will soon become the world's leading killer. We also will present evidence
VOA慢速英语2009年（一）月
Scientists Fear Non-Pest Insects are Declinin Butterflies are as beautiful as the flowers they feed on.But they appear to be less abundant than in years past and that has scientists worried.Because butterflies, bees and other beneficial bugs pollinat
VOA标准英语2018年(九月)
[00:02.70]Unit 22 Environmental Protection Lesson 2 [00:08.46]Exercise 3 Listen to the lecture. [00:11.41]Use the Strategies to write some notes. [00:14.76]Today's lecture will focus on the serious issue [00:17.75]of endangered species. [00:19.90]By
北师大版高中英语模块8(选修)
Five species of shark have been put on a wildlife protection list. The move has been made at the final meeting of the Convention on International Trade in Endangered Species in Bangkok, Thailand. The decision restricts cross-border trade in the ocean
英闻天下
By Lisa Schlein Geneva 12 September 2007 A new report says the number of species threatened with extinction is escalating. The World Conservation Union, which has just released its Red List of Threatened Species, warns life on Earth will continue to
2007年VOA标准英语（九月）
New Species Might be Human Ancestor Fossils found in a South African cave might belong to a new species of early humans that holds a unique place on the evolutionary road to modern man. On a 2008 mapping expedition in Malapa, South Africa, American p
VOA标准英语2011年(九月)
When we lose reefs, we lose basically the cradles of evolution in the oceans. Wolfgang Kiessling A new study out this week highlights the role that coral reefs play in evolution, adding another reason to preserve these delicate, diverse, and often be
VOA标准英语2010年(一月)
JINAN, May 14 (Xinhua) -- Chinese scientists said Saturday that they have found a new species of giant theropod dinosaur in the eastern province of Shandong. The new species, described as a close relative of Tyrannosaurus rex (T. rex), has been named
英语新闻
Researchers working for the World Wildlife Fund have warned that the effects of climate change pose a serious threat to rare species of wildlife discovered within the past year in Southeast Asia, including a fanged frog and a leopard-striped gecko. A
英语杂谈
From the first weekend in May until July, hunters in New Zealand are allowed to shoot ducks for sport. This is called the duck shooting season. Hunters have to get a licence and can kill only a limited number of ducks each day. There are only three t
新西兰英语
Since the pre-historic times, man has had an urge to satisfy his needs. Be it hunger, shelter or search for a mate, he has always manipulated the circumstances to the best of his advantages. Probably this might be the reason why we human are the most
英语美文
Ornithological trends 英国鸟类迁徙趋势 This bird has flown 有所改变 Why some species are thriving outside southern England 为什么英格兰南部有些物种开始兴盛？ WHEN people talk about a north-south divide in Britain they are
经济学人文艺系列
CANBERRA, March 23 (Xinhua) -- Up to 45 native species in Western Australia's Kimberley region will die out within 20 years if no action is taken, latest study showed on Wednesday. The Priority Threat Management to Protect Kimberley Wildlife report,
英语新闻
Coincident with concerns about the accelerating loss of species and habitats has been a growing appreciation of the importance of biological diversity，the number of species in a particular ecosystem，to the health of the Earth and human well-being
托福英语
Can Animals Count? 动物会数数？ Can animals count? People count easily, from the time we are little kids and learn our one-two-threes. But what about other species? Careful observations in the wild support the idea that some can. The American c
英语听力文摘 English Digest
Yet there is surprisingly little agreement on how many phyla there are or ought to be. 然而，令人吃惊的是，在关于有多少门或诙有多少门的问题上，人们的看法大相径庭。 Most biologists fix the total at about thirty, b
万物简史
Goodness knows what the results would be if anyone attempted a similar exercise with the planet's estimated 20,000 types of lichens, 50,000 species of mollusk, or 400,000-plus beetles. 要是有人试图对这颗行星上的大约2万种地衣、5万多
万物简史
In principle you ought to be able to go to experts in each area of specialization, ask how many species there are in their fields, then add the totals. 原则上，我们可以去找一找每个专门领域的专家，问一问他们的领域里有多少
万物简史
Disputes and reorderings of much the same type can be found in all the other realms of the living, 同样的争吵，同样的重新分类，也发生在所有别的生物领域， so keeping an overall tally is not nearly as straightforward a matter
万物简史