中国历史上有几次大规模的修筑长城？
How many times were the Great Wall built in large scale in Chinese history?
自秦朝开始，修筑长城一直是一项大工程。
Since the qin dynasty began to build Great Wall, is always a big project.
在一个能够修筑6000公里长城和在长江建设大坝的国家，极少有事情是不可能的。
In the country that built a 6,000-kilometer wall and dammed the Yangtze, very little is impossible.
因此，他决定修筑一道长城。
明长城的修筑是为了抵御北方游牧民族的入侵。
It was built to ward off the invasion of nomads from the north.
明长城的修筑是为了抵御北方游牧民族的入侵。
It was built to ward off the invasion of nomads from the north.
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