<i id="ucbhp"><bdo id="ucbhp"></bdo></i>
      <source id="ucbhp"></source>

        <u id="ucbhp"></u>

      1. <i id="ucbhp"></i>

        手机APP下载

        您现在的位置: 首页 > 在线广播 > 科学美国人 > 科学美国人科学系列 > 正文

        科学美国人60秒:罗马人四处寻找木材

        来源:可可英语 编辑:aimee ?  VIP免费外教试听课 |  可可官方微信:ikekenet
         下载MP3到电脑  批量下载MP3和LRC到手机
        加载中..
        *OHLh,g78lVI@

        AKBR3SdyUz^qes

        This is Scientific American's 60-second Science, I'm Christopher Intagliata.
        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, marble. And a few years ago, they found the wooden foundations of a luxurious porch from a Roman villa.
        So local archaeologists called in Mauro Bernabei of the National Research Council of Italy. He's a dendrochronologist: someone who analyzes tree rings, which give age and environmental info.
        "We have to study wood because it's full, really full, of information!"
        Bernabei and his team found that 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 that contain timber from all over Europe. And they found a match for the Roman lumber—from the Jura region of eastern France, more than 600 miles away.

        N_,1N1(3I0O1+i)nTA

        木材.jpg
        The researchers also determined that the French timber was harvested in about 40 to 60 C.E. And some of it came from trees already up to 300 years old when they were felled. The details are in the journal PLOS ONE.
        The discovery is the first definitive evidence of oak from north of the Alps being used to build ancient Rome. And it's a reminder that the Romans had a sophisticated trading network. These logs, for example, likely floated down two rivers, across the Mediterranean and up another river to Rome.
        Bernabei says Roman archaeologists usually destroy ancient wood—it's not as prized as jewelry and vases and mosaics. But he's hoping this study might change their minds.
        "Save the wood, yes! And call me,if you don't want to save—please, call me!"
        Thanks for listening for Scientific American's 60-second Science. I'm Christopher Intagliata.

        qCwE[8-Wx95gV;fWLg

        NYThYMAO)06OAH2=

        KfwV3*yHlMB%O)9)aG;fWTc_vX9=Dh%trqqG41T=vw5rW

        重点单词   查看全部解释    
        determined [di'tə:mind]

        想一想再看

        adj. 坚毅的,下定决心的

         
        unearth ['ʌn'ə:θ]

        想一想再看

        vt. 发掘,掘出,发现并披露

        联想记忆
        luxurious [lʌg'ʒu:riəs]

        想一想再看

        adj. 奢侈的,豪华的

         
        jewelry ['dʒu:əlri]

        想一想再看

        n. 珠宝,珠宝类

         
        definitive [di'finitiv]

        想一想再看

        adj. 决定性的,权威性的,确定的,限定的 n. 限定

        联想记忆
        marble ['mɑ:bl]

        想一想再看

        n. 大理石
        vt. 使有大理石的花纹

         
        contain [kən'tein]

        想一想再看

        vt. 包含,容纳,克制,抑制
        vi. 自制

        联想记忆
        determine [di'tə:min]

        想一想再看

        v. 决定,决心,确定,测定

        联想记忆
        surveyor [sə:'veiə]

        想一想再看

        n. 测量员,检查人员

        联想记忆
        sophisticated [sə'fistikeitid]

        想一想再看

        adj. 诡辩的,久经世故的,精密的,老练的,尖端的

        联想记忆
        ?
        发布评论我来说2句

          最新文章

          可可英语官方微信(微信号:ikekenet)

          每天向大家推送短小精悍的英语学习资料.

          添加方式1.扫描上方可可官方微信二维码。
          添加方式2.搜索微信号ikekenet添加即可。
          扑克圈官网 | 扑克圈下载链接