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科学家发现乌鸦能掌握几何规律性，这是首次在人类之外的动物中发现几何直觉。人类非常擅长从形状中观察到几何规律性。其它动物也具有某种与生俱来的几何感，但此前的研究并没有测试它们是否能区分几何规律。研究人员表示其它动物可能也具有几何直觉。在实验中，研究对象是两只腐肉乌鸦，它们参加了在计算机屏幕上找不同几何形状的游戏。它们必须从屏幕上的一组形状中识别不同的形状从而获得美味食物的奖励。举例来说，屏幕上展示五个月亮和一朵花，乌鸦必须正确啄花朵才能获得奖励。在乌鸦熟悉游戏之后，研究人员开始展示正方形、平行四边形或不规则四边形等各种形状。举例来说，研究人员展示了四个完美的正方形以及一个略微变形的四边形。这些四边形都十分相似，乌鸦能否识别其中的异常？结果显示乌鸦能够。测试表明乌鸦能感知直角、平行线和对称性。 NPR: A crow's math skills include geometry Science Advances：Crows recognize geometric regularity
科学家发现乌鸦能掌握几何规律性，这是首次在人类之外的动物中发现几何直觉。人类非常擅长从形状中观察到几何规律性。其它动物也具有某种与生俱来的几何感，但此前的研究并没有测试它们是否能区分几何规律。研究人员表示其它动物可能也具有几何直觉。在实验中，研究对象是两只腐肉乌鸦，它们参加了在计算机屏幕上找不同几何形状的游戏。它们必须从屏幕上的一组形状中识别不同的形状从而获得美味食物的奖励。举例来说，屏幕上展示五个月亮和一朵花，乌鸦必须正确啄花朵才能获得奖励。在乌鸦熟悉游戏之后，研究人员开始展示正方形、平行四边形或不规则四边形等各种形状。举例来说，研究人员展示了四个完美的正方形以及一个略微变形的四边形。这些四边形都十分相似，乌鸦能否识别其中的异常？结果显示乌鸦能够。测试表明乌鸦能感知直角、平行线和对称性。 NPR: A crow's math skills include geometry Science Advances：Crows recognize geometric regularity
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The SSE was the first modern stock exchange to open in China, with trading commencing in 1990. It has now grown to become the largest stock exchange in Asia and the third-largest in the world by market capitalization, which stood at RMB 50.6 trillion (US$7.8 trillion) as of September 2021. Stocks (both A-shares and B-shares), bonds, funds, and derivatives are traded on the exchange. The SEE has two trading boards, the Main Board and the Science and Technology Innovation Board, the latter more commonly known as the STAR Market. The Main Board mainly hosts large, well-established Chinese companies and lists both A-shares and B-shares.
In many cases, the content resembled that of the marketplaces found on the dark web, a group of hidden websites that are popular among hackers and accessed using specific anonymising software.“We have recently been witnessing a 100 per cent-plus rise in Telegram usage by cybercriminals,” said Tal Samra, cyber threat analyst at Cyberint.The rise in nefarious activity comes as users flocked to the encrypted chat app earlier this year after changes to the privacy policy of Facebook-owned rival WhatsApp prompted many to seek out alternatives.telegram from in
