单词：replacement level fertility
单词：replacement level fertility 相关文章
Medieval Christmas was a weird mixture of Christianity and Pagan customs. Along with the boar's head no Christmas feast was complete without the giant Yule Log. If you've ever enjoyed a slice of choco
圣诞特辑
The full moon triggers a frenzy of activity. 满月会引发一连串狂乱的事件 It is the time of the highest tides. 海水在此时达到满潮 And in the oceans the full moon's bright light 在海中，满月明亮的胧光 is a mating call fo
2013年VOA慢速英语(三)月
'Fertility treatment is seen as low-hanging fruit' SATURDAY Fertility Fairness campaign group said fertility treatment is seen as low-hanging fruit.
英语听力精选进阶版
China's birthrate is moving toward a dangerously low level. Experts are calling for scrapping of restrictions on a second child as soon as possible, and even more aggressive changes to the family planning policy. Wu Guoxiu speaks to an expert from th
cctv9英语新闻2015年
This is Scientific American's 60-second Science. I'm Cynthia Graber. This will just take a minute. Guys, heres another reason to eat your veggies: they might be good for your sperm. Some studies show that male fertility and whats called seminal quali
Scientific American(六)月
4.人口红利 Demographic dividend 全国人大常委会委员、中国社科院学部委员、人口与劳动经济研究所所长蔡昉表示，中国人口红利消失的拐点已在2012年出现，将对经济增长产生显著影响，我们应当
英语笔译
This is the VOA Special English Agriculture Report. Sorghum farmers in eastern Uganda, working with scientists, have tested some lower-cost ways to improve their soil. Little rain and poor soil fertility are problems in that area, as in other parts
VOA慢速英语2007年（六）月
Approximately 6.6 billion people populate the earth today, with an estimated 3.7 billion living in Asia. But over the past 50 years, economic and social modernization in the region has been accompanied by a remarkable drop in birth rates. Sociologist
VOA标准英语2011年(一月)
Schools in north China's Shanxi Province have been banned from organizing overseas study tours for profit after a plane crash killed two Chinese girls in San Francisco. The provincial education department announced the ban in a statement issued on Tu
世界各地新闻集锦
By Melinda Smith Washington 16 November 2007 For at least three decades, Americans have been encouraged to put down their cigarettes and quit the habit -- for at least one day [November 15th]. The Great American Smoke Out, as the day is called, is de
VOA常速英语2007年（十一月）
专家预测:2050年地球将面目全非 The earth's population could top nine billion by 2050, leading to an 'unrecognisable' world as people compete for scarcer resources a U.S. science conference heard yesterday. 有美国科学家警告，到205
实用英语
China's family planning 中国计划生育政策 Illegal children will be confiscated 违法生育就没收孩子 The one-child policy is not just a human-rights abomination; it has also worsened a demographic problem 独生子女政策不仅在人权方
经济学人综合
China's population中国人口 The most surprising demographic crisis出乎意料的人口危机 A new census raises questions about the future of Chinas one-child policy 新的人口普查结果对中国独生子女政策的未来提出了质疑 DOE
经济学人综合
Wilbur crouched low, with his thin, curly tail toward the rat. 威尔伯蹲低身子，让它那条细细的弯尾巴对着老鼠。 Templeton seized the string, passed it around the end of the pig's tail, and tied two half hitches. 坦普尔顿抓住绳
夏洛的网
Guys, heres another reason to eat your veggies: they might be good for your sperm. Some studies show that male fertility and whats called seminal quality have declined over the last few decades. So researchers from two fertility clinics in Spain loo
60秒科学
HEALTH REPORT - Heart Disease in Women By Jerilyn Watson Broadcast: Wednesday, February 18, 2004 This is Phoebe Zimmermann with the VOA Special English Health Report. Studies show that many American w
健康与经济
According to the Washington Post of September 26, Japan's government has been paying more attention to the nations fertility rate, which influences the country's economic development。 The coastal region of Fukui has Japan's biggest share of dual-in
阅读空间
Egg The star of Easterpainted, dyed, gilded in silver and gold, blown empty and hung on trees--is the egg. Legends abound about this symbol of life. Around the world they are brought to church, given as gifts, hidden for the benefit of children and e
雅思英语
新托福口语的阅读材料不长，但题材广泛，而考生的知识又受限于自己所学的专业，不可能面面俱到。这样，当遇到材料的内容非常陌生时，尽管表面上看没有生词，也难免会出现读不懂的现
托福英语