标签：医学文摘 相关文章
Hi there, I'm Sonali from the BBC World News for Children Team. It's Friday the 4th of June. Coming up..... McDonald's has pulled Shrek glasses over health fears. There's been a massive fire in Bangladesh. And Stosur reaches the French Open final in
英语听力文摘 English Digest
Some methods of preserving food are easy to understand. For example, it's easy to see that freezing your food, or packing it in salt, would make it inhospitable to the microbes which would otherwise cause it to spoil. You might wonder, however, about
英语听力文摘 English Digest
It's a common enough sound in summer, after the wind finally picks up on a hot and humid afternoon, as the rain starts spattering down in big, fat drops--you're in for a full-blown thunderstorm. It's much less common in winter, even during a snow sto
英语听力文摘 English Digest
Squirrel vs. Snake So lets say youre a common ground squirrel. Just for a moment, pretend youre minding your own business, searching for seeds, doing whatever it is that squirrels like to do. Then, suddenly, out from behind a bush slithers a huge, si
英语听力文摘 English Digest
Y: I noticed that fish have holes that look like nostrils, does that mean they can smell? D: Smell, or olfaction, as scientists call it, is an important sense for many fish. Those little holes that look like nostrils are called nares. Nares dont lead
英语听力文摘 English Digest
D: OK, Yael, you want to build an aquatic robot,and you're trying to figure out the most efficient way to move it through water, what do you do? Y: I am guessing the answer isn't to build a robot using a lot of root-force to move forward? D: Anyone w
英语听力文摘 English Digest
Getting Rid Of Cavities 牙痛是继续忍受还是提前做好防护?爱护牙齿，每天的必修课。 M:Sorry,I'm late.I was brushing my teeth. W:Brushing your teeth?Right before 'A Moment Of Science'? Why? M:I'm trying to get rid of a cavity. W
英语听力文摘 English Digest
Sometime Cavemen 我们的祖先是否一直生活在一个地方呢？山顶洞人就一直生活在山洞里吗？ From the bestselling novel Clan of the Cave Bear to the 1981 movie Caveman, pop-culture tends to misrepresent prehistoric people as c
英语听力文摘 English Digest
What Time Of Day Is Best To Feed Infants So That They Fall Asleep 把孩子养大可不是一件容易的事。婴儿没有时间观念，他可不管自己的爸爸妈妈累了一天晚上需要休息。更要命的是，孩子似乎觉得晚上的安
英语听力文摘 English Digest
Where Does The Term'Limelight'Originate You're in the limelight now on this moment of science. If someone loves being in the limelight, that means they enjoy being the center of attention. We use the word now to mean social prominence, but have you e
英语听力文摘 English Digest
Hey! and thenOuch! 伤害性刺激作用于末梢神经引起神经兴奋电活动，沿着脊髓传人神经纤维中的细纤维(A和c纤维)传人脊髓，进而引起痛觉。痛觉是由于痛觉感受器受刺激而诱发的，其他感受器受到
英语听力文摘 English Digest
Word Up, Brain 新发展起来的大脑皮层在调节机能上起着主要作用；而皮层下各级脑部及脊髓虽也有发展，但在机能上已从属于大脑皮层。高等动物一旦失去大脑皮层，就不能维持其正常的生命活
英语听力文摘 English Digest
What Makes a Yo-Yo Yo 悠悠球(YO-YO) 并非一个令人陌生的词眼，史书的最早记录出现在公元500年前的希腊;相传16世纪，菲律宾的狩猎民族在狩猎和格斗使用的器具中，在绳子的前端挂着重物似悠悠的
英语听力文摘 English Digest
Whats It Like There? 水星 (Mercury )，中国古代称为辰星。是太阳系中的类地行星，其主要由石质和铁质构成，密度较高。自转周期很长为58.65天，自转方向和公转方向相同，水星在88个地球日里就能
英语听力文摘 English Digest
Gender-Jumping Toads 美国研究人员说，常用除草剂阿特拉津会令雄蛙变性为雌蛙。美国加利福尼亚大学伯克利分校研究人员把40只雄性非洲爪蛙放入阿特拉津浓度为10亿分之2.5的水中，发现90%雌性化
英语听力文摘 English Digest
Lying to a Machine 不说谎的人觉得它很神秘，说谎的人觉得它很可怕，这就是神奇的测谎仪。面对不断攀升的犯罪，善良的人们总是期望借助科学的灵丹妙药，将所有犯罪分子手到擒来。测谎技术
英语听力文摘 English Digest
Airplane Contrails Have you ever seen a perfectly cloudless sky? Cloudlessthat isexcept for two or three long white lines smeared across the perfect blue sky by airplanes like smudges on a pane of glass. Why do airplanes sometimes leave contrails beh
英语听力文摘 English Digest
Mans Best Friendin All Shapes and Sizes Scientists are making great strides in understanding the genes that allow such a wide range of shapes, sizes and personalities in different dog breeds. Did you know domestic dogs were bred from wolves about 15,
英语听力文摘 English Digest
Why Frisbees Fly With a gentle flick of the wrist on a warm summer day, you can launch a frisbee on a long and graceful flight. Why do they fly so well? One reason is something called gyroscopic force. This is the tendency of a spinning object to mai
英语听力文摘 English Digest
Who Believes in Vampires? 吸血鬼，傳說中永生不老的超自然不死生物。吸血鬼的典型形象和特征是：牙齒尖長，皮膚白皙，眼睛发红。吸血鬼害怕照射到陽光，在太陽下會烧起来变成灰。但是也认为
英语听力文摘 English Digest