单词：bespurts
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Don: Time to go again to the A Moment of Science mailbag. A listener writes: Dear Don Yal, I read somewhere that there's more oil in the Western part of the United States and Canada than in Saudi Arabia. Is that true? Yal: Great question! And the ans
英语时差8，16
By Jessica Berman Washington 03 August 2007 There's a period in the development of toddlers when they seem to learn a new word every day. There are different theories about why young children undergo what experts call a word spurt. But one psychologi
2007年VOA标准英语（八月）
This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Parents wring their hands over infant sleep patterns. And so when those patterns change, parents tend to panic. But if your baby is sleeping more or na
Scientific American(五)月
As five European foreign ministers meet in Copenhagen to prepare for an aggreement to succeed the Kyoto Protocol, scientists in Greenland are warning about accelerated glacier melts. Several years ago, scientists reported that the Helheim Glacier, su
自然百科2009年
Radiation causes damage at the most fundamental level. It mutates the blueprint of life, DNA. Earth's magnetosphere is our crucial defense. It's so fundamental to our evolution and continued existence that the race is on to understand why it's changi
自然百科2011年
It's a digestive process more like those of carnivores. And Sauroposeidon has another trick for growing to mammoth proportions--hollow bones. Its backbone, neck, and ribs have walls just a few milometers thick. Even its limbs are far less dense than
探索与发现2013年
When I was seven years old, I would put my school book bag on both my shoulders and had it sit plumb in the middle of my back, as backpacks were made to do. 在我七岁那年，我会用双肩背书包，让它处在我背部的正中央，感觉双肩
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But after all, Lenina was protesting, it's only about four months now since I've been having Henry. 可是毕竟，列宁娜在抗议，我跟亨利一起才四个月左右。 Only four months! I like that. And what's more, Fanny went on, pointing an
美丽新世界
When George Washington University announced last week that it was laying off nearly 50 employees to reduce costs, the universitys president, Steven Knapp, blamed a decline in enrollment in graduate and professional programs. 上周，乔治华盛顿大
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The angry green giant is back! Dr. Bruce Banner (Edward Norton) has exiled himself to Portugal after his experiment with gamma radiation went awry, turning him into a superhuman rageaholic whose growth spurts and pigment change signal impending destr
英语时差8，16
1. When I was seven years old, I would put my school book bag on both my shoulders and had it sit plumb in the middle of my back, as backpacks were made to do. 在我七岁那年，我会用双肩背书包，让它处在我背部的正中央，感觉双
英语PK台
Economics Brief 经济学简介 Six Big Ideas: Overcapacity and undercapacity 六大经济学理论：产能过剩和产能不足 Glutology 过剩的学问 The third brief in our series on big economice ideas looks at Say's law 我们有关重大经济
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