你永远无法想象世界的广阔，实际上，我们的地球太大了，一个人你不可能在短暂的一生走完所有的角落，但是，我们可以通过书籍去往世界上的所有地方。好奇五人组早上起床了，他们看见太阳从东边出来。太阳升起时，光线也变明亮了，很快，所有人都准备出门了。快看那条笔直的光线，它是从太阳发出来的光......
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