A Great Wall
What I would like to introduce today is a great wall that you have never seen. It was . In contrast to the well-known Great Wall, this great wall stood up in the desert around two thousands years ago. Because of the extreme environment and limited technology, the wall was built by benches of tree and soil with gravel instead of bricks. After thousands years' corrosion and destroy, only the ruin of this great wall is remained.
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A Great Wall
What I would like to introduce today is a great wall that you have never seen. It was . In contrast to the well-known Great Wall, this great wall stood up in the desert around two thousands years ago. Because of the extreme environment and limited technology, the wall was built by benches bundles of trees and soil with gravel instead of bricks. After thousands of years, corrosion and has destroyed it; only the ruins of this once great wall is remained.
写得不错，Shawn！希望我修改的能帮助你。有问题请别怕问 =)
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