科学美国人60秒 SSS 2013-09-17
时间：2018-12-24 作者：英语课 分类：Scientific American(九)月
英语课
This is Scientific Americana 60 Seconds Science, I'm Christopher Intagliata, got a minute.The Sahara desert isn't known for its greenery, but there's evidence it was once much lusher than today, dotted with waterfall and lakes, now a study suggests three massive 1 rivers used to plough through the desert too, cutting pathways north to the * coast.
Researchers use climate models to estimate rainfall more than the 100,000 years ago, they found the ancient * formed four hundreds miles north of where they do today, spreading rain on the mountains and central Sahara, that storm water would have drained north powering three rivers the size of the Nile and forming vast wetland in what is now Libya. The west most river, referred to as the * was the most likely pass for migrants and clusters 2 of archaeological sites in * and * back up to that idea, the analysis is in the journal Plus One. There is no telling whether humans made it to Europe by these routes, but the alternatives were traveling along the Africa's west coast or up the Nile. So these rivers would offer a nice shortcut 3, now of course, the waterways with buried beneath the dooms 4, along with any foot prints our ancestors may have left behind. Thanks for the minute, for Scientific American 60 Seconds Science, I'm Christopher Intagliata.
1 massive
adj.巨大的，大规模的，大量的，大范围的
- A massive sea search has failed to find any survivors.经过大规模的海上搜救仍未找到幸存者。
- He drank a massive amount of alcohol.他喝了大量的烈酒。
2 clusters
n.（果实、花等的）串( cluster的名词复数 )；簇；（人、物等的）群；组v.（使）集中( cluster的第三人称单数 )
- These small particles agglomerate together to form larger clusters. 这些颗粒聚结形成较大的团。
- Sometimes several clusters of white clouds drift across the blue sky. 蔚蓝色的天空中，时而飘过几朵白云。 来自《现代汉英综合大词典》