单词：valley plain
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This is Scientific Americans 60-Second Science. Im Steve Mirsky. Got a minute? Ever been woken up by the sound of the refrigerator compressor kicking on? Well, such clumsy heat exchange units featuring long metal coils may be on their way out. Becaus
Scientific American(八)月
This is Scientific Americans 60-Second Science. I am Cynthia Graber. This will just take a minute. Ants are known for working together, operating as a unit for the good of the colony. But not so fast, say researchers from the Universities of Leeds an
Scientific American(三)月
By Peter Heinlein Shimelba Refugee Camp, Northern Ethiopia 31 October 2007 Rising tensions between Ethiopia and Eritrea have led to an increasing flow of refugees across their common frontier. A border war between the Horn of Africa neighbors from 19
2007年VOA常速英语（十月）
By Scott Bobb Johannesburg 20 December 2007 Zimbabwe ended 2007 with uncertainty looming over national elections scheduled for next year. Negotiations aimed at holding a free and fair vote had made progress, but remained deadlocked over key points. S
VOA常速英语2007年（十二月）
By Peta Thornycroft Harare 18 February 2008 There is growing uncertainty in Zimbabwe as politicians and analysts realize that President Robert Mugabe is likely to face a run off after the March 29 elections. For VOA, Peta Thornycroft in Harare report
VOA常速英语2008年（二月）
今天我们要学的词是random。 Random, 是随机、任意的意思。The firefighters have to undergo a random drug test once a year, 消防队员每年要接受一次是否服用毒品的抽查。The boxer refused to submit random blood tests
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