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研究称，考古学家利用无人机和谷歌地球影像等技术手段在中美洲的伯利兹发现一个有4000年历史的渠道网络。研究小组随后在该国一处野生动物保护区进行挖掘。据美联社报道kaiyun下载app下载安装手机版，该项研究的作者之一、新罕布什尔大学教授埃莉诺·哈里森·巴克说，航空图像对于辨认这种贯穿湿地数英里(1英里约合1.6公里)的之字形渠道至关重要。
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The 19th Group of Twenty (G20) Summit was held in Rio de Janeiro Brazil from Monday to Tuesday. In the face of geopolitical conflicts and economic uncertainties, the G20 Summit is expected to exert positive impacts and inject more stability into an unstable world, said Cui Shoujun, Professor and Director of the Institute of International Development Studies at the School of International Studies, Renmin University of China (RUC), in the W.E. Talk with China News Network.
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