英语听力：自然百科 Indian Hot Spot

 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.

1 datum   

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   

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   

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。