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Asked by Ms.Bonnie | Nov. 26, 2010 20:29
About:Hiking from Jinshanling to Simatai

What invention of war made it essential to build the wall with bricks?

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Answered by Mr.lala | Nov. 26, 2010 22:51
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At the cold weapon age, the brick wall was strong enough to defend the enemy's knives.
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