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英语听力：自然百科 Indian Hot Spot

时间：2014-05-07 06:12:18

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 Nature reports results from GRACE, a satellite machine designed to use gravity measurement to monitor the world's water resources.

 
GRACE is the Gravity Recovery and Climate Experiment and it's a two-satellite machine. These two satellites are following each other around in orbit around the earth and instead of looking downward like most earth-orbiting satellites do, these satellites are actually looking each other and measuring the distance between the two satellites.
 
The datum1 reveals a serious problem in northern India.
 
India is a hot hot spot on the trend map. It’s a well constrained2 signal that's extremely strong and in this case negative. So it's one that really caught our attention.
 
And subtracting relevant signals, the water table here averaged a 6-meter drop.
 
Over the course the 6-year time series, you can see that we go from a lot of blues3 to yellows to eventually a situation where it's mostly red and that shows us approximately where these groundwater source declines have occurred.
 
India is a very populated region. 20% of the entire population of the world is residing in India, and only 4% of the water source on earth is in India.

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1 datum JnvzF     
n.资料；数据；已知数
参考例句：
  • The author has taught foreigners Chinese manyand gathered rich language and datum.作者长期从事对外汉语教学，积累了丰富的语言资料。
  • Every theory,datum,or fact is generated by purpose.任何理论，资料、事实都来自于一定的目的。
2 constrained YvbzqU     
adj.束缚的,节制的
参考例句：
  • The evidence was so compelling that he felt constrained to accept it. 证据是那样的令人折服，他觉得不得不接受。
  • I feel constrained to write and ask for your forgiveness. 我不得不写信请你原谅。
3 blues blues     
n.抑郁，沮丧；布鲁斯音乐
参考例句：
  • She was in the back of a smoky bar singing the blues.她在烟雾弥漫的酒吧深处唱着布鲁斯歌曲。
  • He was in the blues on account of his failure in business.他因事业失败而意志消沉。

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