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Popular philosophy 哲学史讲演录
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Popular philosophy 中华学生百科全书:地球奥秘
Posted on 2010-08-25
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到底哪种说法正确,灭绝恐龙的元凶是一个还是几个?还待进一步研究。妙趣横生的地球方向东西南北是人给地球确定的方向。人们确定顺着地球自转的方向为东,逆着地球自转的方向为西。地球绕一个假设的地轴自转,地轴的两端,人们称它为两极,看到地球自转的方向为逆时针的端,就是北极;反之,另一端便是南极,站在南极看地球自转是顺时针的。
由于地球是个球形,地球的方向也因此趣味横生。 没有尽头的东、西方:如果你从地球两极以外的任何一点出发,一直朝 东走,你的前方永远是东。即便绕地球一周回到原地,再继续朝前走,仍旧 是东,无休无止。向西走也是同理。也就是说,向东走,你找不到东的头; 向西行,你看不到西的边。所以东、西方向又称无限方向。
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