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It seems to us that the earth stands quite still. But it is really moving all the time. It turns around a make-believe line through its center. We call this make-believe line the earth's axis . The two ends of the earth's axis are called its poles. It makes the earth twenty-four hours travel around its axis once.
We look at the sun and say it "rises" and travels across the sky, but the sun doesn't really do so. It is the turning of the earth which makes us feel as if the sun were moving across the sky. We can't see that the earth is moving because everything else on the earth is turning with us. As the earth turns around every twenty-four hours, first one half faces the sun and then the other half. When our half of the earth is facing the sun, we say it is day. When our half is away from the sun, we say it is night. It is the turning of the earth that tells us when to go to bed and when to get up.
在我们看来,地球总是静止着的.但其实它一直在运动.地球总是绕着一个我们假想的线——地轴不停地旋转.地轴的两端被成为地球的两极.地球绕着地轴旋转一圈需要24小时.我们总是说太阳从东边升起,在天空中穿过.但其实太阳并没有那么做.是因为地球不停地在转使得我们觉得太阳好象在天上走一样.而我们不能感觉地球在运动是因为我们总是跟着它一起在旋转.在地球旋转一圈的24小时中,地球的一面先对着太阳,后面一半时间就是另一面对着太阳.当我们所处的地球的那一面对着太阳的时候,我们就处在白天;而当我们这一面背对着太阳的时候,那就是晚上.是地球的旋转告诉我们什么时候该起床,什么该去睡觉.
1年前
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