盛夏时节，杭州市余杭区一支由7至14岁少年组成的少年龙舟队正在集训。 当地的五常龙舟胜会已有500多年的历史，被列入国家级非物质文化遗产名录。 40多年前的龙舟胜会上，曾有一支少年队伍亮相 ...

侯德榜的《纯碱制造》打破西方技术垄断，被俄罗斯专家视为制碱“圣经” ...

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人类社会的经济发展长期受制于“马尔萨斯陷阱”，即经济增长虽然带来人均收入的提升，但也同时促进了人口增加，进而又将人均生活水平拉回初始状态。直到18至19世纪，这一约束才被突破，人类生活水平开始实现持续提升。著名经济学家Oded ...

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Notice: The content above (including the videos, pictures and audios if any) is uploaded and posted by the user of Dafeng Hao, which is a social media platform and merely provides information storage ...

Notice: The content above (including the videos, pictures and audios if any) is uploaded and posted by the user of Dafeng Hao, which is a social media platform and merely provides information storage ...