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人类社会和自然世界是那么丰富多彩，使我们对于那许许多多的难解之谜，不得不密切关注和发出疑问。人们总是不断地去认识它，勇敢地去探索它。虽然今天科学技术日新月异，达到了很高程度，但对于许多谜团还是难以圆满解答。人们都希望发现天机，破解无限的谜团。古今中外许许多多的科学先驱不断奋斗，一个个谜团不断解开，推进了科学技术的大发展，但又发现了许多新的奇怪事物和难解之谜，又不得不向新的问题发起挑战。科学技术不断发展，人类探索永无止境，解决旧问题，探索新领域，这就是人类一步一步发展的足迹。
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