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.
明朝初年大规模修筑长城，约200年后完成，东部主要为砖石结构。
The Wall was repaired and maintained over the course of many dynasties, especially during the Ming Dynasty, when the work continued for some 200 years.
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