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长城始建于战国时代，修建的历史一直延续到明朝，持续了2000多年。它是世界上修建时间最长、工程量最大的军事防御工程。历史上各个时代修筑的长城加起来，总长度超过了50 000千米。现存的明长城西起嘉峪关，东到鸭绿江，全长也在6 300千米以上。它是当之无愧的“万里长城”！
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