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[科学美国人60秒] SSS 2019-12-13

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[科学美国人60秒] SSS 2019-12-13

SSS 20191213

sss
60秒科学节目(SSS)是科学美国人网站的一套广播栏目,英文名称:Scientific American - 60 Second Science,节目内容以科学报道为主,节目仅一分钟的时间,主要对当今的科学技术新发展作以简明、通俗的介绍,对于科学的发展如何影响人们的生活环境、健康状况及科学技术,提供了大量简明易懂的阐释。

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[Homework]SSS 2019-12-13

Rome wasn't built in a day.And neither was the Roman subway system. Underground work is slow going because construction crews often unearth mosaics,frescos and marble. And a few years ago they found a wooden foundation of a luxurious porch from a Roman villa.So local archaeologists called in ? of the national research council of Italy. He is a ?,some one who analyzes tree rings which give age and enviromental info.We have to study wood because it's full, really full of information.? and his team found the wooden planks were oak, but the wood's origin was harder to determine, so they compared the tree rings in the oak planks to those available in libraries of tree rings. They contain timber from all over  Europe. And they found a match for the Roman lumber from the ? region of eastern France more than six hundred miles away. The researchers also determine that the French timber was harvested in about forty to sixty CE. And some of it came from trees already up to three hundred years old when they were felled. The details are in the journal plus one.The discovery is the first of a infinitive evidence of oak from north of the Alps being used to build ancient Rome. And it's reminder that the Romans had a sophisticated trading network. These logs, for example, likely floated down to rivers across the Mediterrenian and up another river to Rome. ? says Roman archaeologists usually destroy ancient wood. It's not prized as jewelry and vases and mosaics. But he is hoping this study might change their minds. Save the wood, and yes call me. If you don't want to say, please call me.                                                   
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