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现代科学告诉我们,"扫把星"其实就是天上(tian shang)的彗星,跟其寓意并无关联。彗星是环绕太阳运行的云雾状的天体(tian ti),是太阳系大家庭里的特殊成员,它的出现其实是一种极普通的自然现象。在运行的大...