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简介：So from the bottom of his heart, Emperor Chongzhen said to the prince that the Great Wall might not be able to hold, and that it needed to complete the second and third lines of defense. The suggestion was contradictory - why can't it be held? We have so many soldiers in the Ming Dynasty, and the Great Wall is built in dangerous places. We could hold on to it in the past, why can't we hold on to it now?