单词：ratio of males and females
单词：ratio of males and females 相关文章
In addition to the CAT scans and the fossil remains, paleontologists looked to modern animal behavior for clues. 除了CT扫描和化石残骸以外，古生物学家们还在现代动物行为中寻找线索。 The one thing that doesn't change in t
侏罗纪搏击俱乐部
When male Antarctic fur seals head to the beach each spring, it's no vacation. They are basically gonna be here for a month, holding their territory not eating, not sleeping, and just hoping they get some females in. 95% of the Antarctic fur seal pop
国家地理2007年
Male nursery web spiders often woo potential lady-friends with gifts wrapped in silk. Mating may ensue, during which a female unspools the present, expecting to find a tasty treat. But the males can be unscrupulous. Some offerings contain inedible pl
Scientific American(十一)月
This is Scientific Americans 60-second science, Im Sophie Bushwick. Got a minute? To vocalize, animals create sound waves in the pipeline vocal checks. Shorter pipes produce higher frequency sounds, so smallest animals like the cuddly koala should ha
Scientific American(九)月
This is Scientific Americans 60-Second Science, Im Cynthia Graber. Thisll just take a minute. Songbirds sing to entice mates, and the timing of those songs is often regulated by sunlight. But that timing is getting thrown offby streetlamps. Thats acc
Scientific American(九)月
【原文】 This week on Why? Tell Me Why! We are answering a viewer question as to why lightning bugs light up. Lightning bugs light up basically to find a mate. Its a way that lightning bugs communicate witheach other, to call each other together,
英语听力广播—Listening
今天文章讲的是男性基因染色体的问题，如果男性染色体正发生着变化，会造成地球上男女比例失衡吗？ Neil: Hello and welcome to Six-Minute English from BBC Learning English, I'm Neil and with me today is Rosie. R
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Sexual selection and evolution 性选择与进化 My pretty maid 美丽的雌性 A glamorous raiment sometimes helps a female bird as much as it helps a male 华丽的外表有时给雌性的益处和雄性一样多 HOW the peacock got his tail is on
经济学人科技系列
Neil: Hello and welcome to Six-Minute English from BBC Learning English, I'm Neil and with me today is Rosie. Rosie: Hi there. Neil: Well, today we're talking about men. Rosie: That sounds interesting. Neil: It is very interesting especially if you'r
六分钟英语
This is Scientific American 60 Second Science, I'm Cynthia Graber, this will just take a minute~ You know the sceneits a Friday night, and your date just canceled. Youre bummed, maybe a little hurt. You think now might be a good time for a beer, mayb
Scientific American(三)月
The second Monday of January is Coming-of-Age Day, a national holiday to encourage those who have newly entered adulthood to become self-reliant members of society. The holiday used to be on January 15, but in 2000 it was moved to the second Monday o
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Amir: Maybe it's something I have to mention about Iranians, we don't kiss, of course, on the lips. It's only on the cheek. Tu: Yes, even on the cheek? Amir: Yes, on the cheeks. Tu: Even on the cheeks. Amir: Well, men in Iran kiss each other on the c
原版英语对话1000个
It's about 5,000 meters above sea level, way above the point at which altitude sickness starts to affect humans. At this height, most people are gasping for breath. But lack of oxgygen hasn't cramped this creature's style. Chiru, or Tibetan antelope
自然百科2010年
India rapped over birth bias 印度因婴儿性别偏见遭谴责 India is seeking to get population growth down 印度正在寻求降低人口出生率的办法 The United Nations Population Fund has taken India to task over its ratio of females to
双语有声阅读
研究：人的鼻子能嗅出性别 WASHINGTON, May 1 (Xinhua) -- The human nose can sniff out gender from body secretions even though people don't think they smell anything, Chinese researchers reported Thursday. Wen Zhou of the Chinese Academy of
英语新闻
不容忽视的她力量 She-power 今天是三八国际妇女节，女同胞们是不是都放假出去庆祝啦？如果你还坚守在工作岗位，也请你不要沮丧，因为这说明女性的力量越来越强大，没有了女性，男同胞们
英文语法词汇
China's sex ratio is quite worrying nowadays. According to census data, China's sex ratio at birth was 108 males to every 100 females in the early 1980s, only slightly above the natural rate of 103 to 107. In 2000 the ratio was 116.9 males to 100 fem
英闻天下
Statistics New Zealand collects population numbers every year from 1st October to the end of September. The latest figures show that New Zealands population on September 30th was 4,414,400. This is equal to 0.06% of the worlds population. We have 33,
新西兰英语
Science and technology 科学技术 Arachnology 节肢动物学 Having a mate for dinner 情人为食 Male spiders make the supreme sacrifice for their children 雄蛛对后代的无私奉献 AMONG spiders, the female of the species really is more de
经济学人科技系列
Science offers a handy way to distinguish between faithful and promiscuous types: check the length of their fingers. 科学提供了一个辨别忠诚和花心类型的便捷方法：看看手指的长度。 People with a right ring finger thats much
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