・この動画「

在早期，地球的周长是如何被计算出来的，绝妙的埃拉托色尼测量地球圆周法

」@bilibili.comと
　　↓↓↓一緒に視聴されています(Often Viewed With)：↓↓↓
・【如何测量地球直径与周长】讲述古希腊人使用的方法
・计算出地球周长的人绝对是个天才
・2000多年前，有人只用一根杆子就测量出了地球周长。科学思维的力量
・月球正以每年3.8厘米的速度远离我们的地球，你感受到了吗？
・如果地球突然失去氧元素5秒，会发生什么？

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