THE Great Wall which stretches 6,000 kilometers across north China mountains contained many strategic passes, such as Shanhaiguan at the eastern end on the Bohai Gulf and Juyongguan, 50 kilometers...
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THE Great Wall which stretches 6,000 kilometers across north China mountains contained many strategic passes, such as Shanhaiguan at the eastern end on the Bohai Gulf and Juyongguan, 50 kilometers...