英语 英语 日语 日语 韩语 韩语 法语 法语 德语 德语 西班牙语 西班牙语 意大利语 意大利语 阿拉伯语 阿拉伯语 葡萄牙语 葡萄牙语 越南语 越南语 俄语 俄语 芬兰语 芬兰语 泰语 泰语 泰语 丹麦语 泰语 对外汉语

SSS 2009-06-15

时间:2010-05-18 02:51来源:互联网 提供网友:mark@li   字体: [ ]
特别声明:本栏目内容均从网络收集或者网友提供,供仅参考试用,我们无法保证内容完整和正确。如果资料损害了您的权益,请与站长联系,我们将及时删除并致以歉意。
    (单词翻译:双击或拖选)

This is Scientific American's 60-second Science. I'm Steve Mirsky. Got a minute?

 

Could it be that our understanding of rain was all wet? A new study says that some drops of rain are falling faster than they should be. Which ultimately means that it may be raining less than we think.

It’s been assumed that large raindrops fall faster than smaller ones. A big drop’s size and heft give it a faster terminal velocity1. Because it overcomes air resistance better than a small drop. But now researchers have found small raindrops falling faster than some bigger drops, and faster than what their terminal velocity should be. The finding appears in the journal Geophysical Research Letters.

Researchers used sophisticated optical equipment to study about 64,000 individual raindrops, and found the expeditious2 outliers. Which came in clusters. These superfast droplets3 probably come from the breakup of fast-moving large drops. Standard techniques to measure rain assume that fast drops are larger, and therefore overestimate4 the total precipitation. The scientists note that a third of the economy is influenced by weather forecasting, so even a small improvement in our understanding of rain would be more than a drop in the bucket.

 

Thanks for the minute for Scientific American's 60-second Science. I'm Steve Mirsky.
 


点击收听单词发音收听单词发音  

1 velocity rLYzx     
n.速度,速率
参考例句:
  • Einstein's theory links energy with mass and velocity of light.爱因斯坦的理论把能量同质量和光速联系起来。
  • The velocity of light is about 300000 kilometres per second.光速约为每秒300000公里。
2 expeditious Ehwze     
adj.迅速的,敏捷的
参考例句:
  • They are almost as expeditious and effectual as Aladdin's lamp.他们几乎像如意神灯那么迅速有效。
  • It is more convenien,expeditious and economical than telephone or telegram.它比电话或电报更方便、迅速和经济。
3 droplets 3c55b5988da2d40be7a87f6b810732d2     
n.小滴( droplet的名词复数 )
参考例句:
  • Droplets of sweat were welling up on his forehead. 他额头上冒出了滴滴汗珠。 来自辞典例句
  • In constrast, exhaled smoke contains relatively large water droplets and appears white. 相反,从人嘴里呼出的烟则包含相当大的水滴,所以呈白色。 来自辞典例句
4 overestimate Nmsz5Y     
v.估计过高,过高评价
参考例句:
  • Don't overestimate seriousness of the problem.别把问题看重了。
  • We overestimate our influence and our nuisance value.我们过高地估计了自己的影响力和破坏作用。
本文本内容来源于互联网抓取和网友提交,仅供参考,部分栏目没有内容,如果您有更合适的内容,欢迎点击提交分享给大家。
------分隔线----------------------------
TAG标签:   SSS  raindrop
顶一下
(1)
100%
踩一下
(0)
0%
最新评论 查看所有评论
发表评论 查看所有评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:
听力搜索
推荐频道
论坛新贴